All of the singers did a great job but IU's voice is just too comparatively distinct. She's got a bit of an air to the vocals and sustains notes with her notable style, plus her voice just sounds more matured than the rest. Especially during that second song, it was extremely clear which one was her.

The fact that these women can competently share a stage with IU shows just how talented they all are.

IU has this warm huskiness in her voice despite being very high tone. It's unique.

First song might be hard, but anyone who is familiar with the song Good Day can easily guess it

Iu voice is really hard to beat....

Shannon Williams hitting the triple note was my first introduction to her. By the time I saw the clip she'd already released Why Why so I was looking forward to seeing her career develop. She's one of the most gifted vocalists I've heard, she was competent at executing choreography, she was a radiant beauty, and her English was excellent. She's basically Somi if you swapped dancing for vocals. Unfortunately, her career was horribly mismanaged and she never got the stardom she was entitled to based on merits. I'm happy she's found success as a twitch streamer but losing her as a musical artist is a loss for the world.

4:01 I love how sure they were that IU is in no.5 but went confused again while listening to the singers sing the chorus part😂

The first song I didn't know.... But after the second song I IMMEDIATELY knew it was number 5, but my god number 3 really matches her vocals and style pretty closely....

I can find IU's voice no matter what. I've been listening to her for 11 years and I'm a proud uaena.

I’m not even IU’s fan.. but I can differentiate her voice till the end… I bet her voice is so unique and no one can imitate her.. 👏🏼

We have the luxury to use headphones to feel the smallest difference in the voices, but I'm pretty sure it's much harder to hear those difference when you in that hall.

I feel sad for Shannon (Lady in red hat). Her company wasted her talent. She's a skilled and talented singer. She could have been a top singer but her company doesn't know how to manage and showcase her talent.

A no brainer task, IU's voice (sustain, lows, highs), pronunciation and techniques are so articulated. I love she singing some of her earlier songs with her current style, for example. There are so many nuances now that make her sound more pleasing.

i had so much expectations for shannon williams! loved her debut song. she was only 15-16 here too! unfortunately her company gave her the dungeon treatment and she eventually decided to leave. glad she’s found a career as a twitch streamer + voice actor tho!

Taeyeon and IU's episode are the one's easy to guess because their voices are one of a kind in the industry. Their voice are stable af and u can definitely recognize their vibrato.

Too easy, IU too good and too distinct

I recommend watching the full version of this episode. The crowed were really boggled about all of the different nationalities. Also, IU coughed in disbelief/amazement when Shannon said she was 16 years old during the introductions.

Although IU's songs are famous for the high notes, her lower tones are much more distinctive and unique that it's easy to tell her apart. I'm more surprised at the foreigners who can copy her well 🤣 They're so good!

Ahh still sad to see Shannon go having been mistreated. Well done. She was closest to IU for me, the timbre in many frequencies was close 👌 but her low end gave her away though it was nice to hear on IU songs. Very impressive!

IU has the most unique voice in the world, the way she has trained it to be sweet but powerful is beyond amazing.

DAMN ALL FIVE OF THEM HAVE INCREDIBLE VOICE I NEED TO KNOW THEIR NAMES

I hope Shannon (girl with the red hat) will sing again her vocals is too good to be wasted.

At first I thought it was number 3, but then the second song made me think it was number 5. Number 3 did a pretty nice job until the second song I think.

If you listen to IU a lot, you can easily identify her, IU has a unique voice that no one else has.

IU have a euphonious voice 💜💜💜 1:46 Boo 3:58 Good Day 8:12 You & I 12:08 The Story Only I Didn't Know

The girl with the red hat is the closest to IUs voice.. And she is really pretty.

I can’t believe I got it . She was the only one to hit the high note flawlessly . Everyone else had to cut it shorter

Out of all episodes of hidden singer I've watched, this is the only time I've guessed right in every round. All those days growing up with IU's songs really paid off. She has a really unique voice that even if you sound similar to her, you still can't get her techniques right and copy her 100% unless you take your time to study her vocal tones very carefully and thoroughly.

The girl with red hat is most similiar to IU. But i spot them all right. IU voice is so easy to distinct, but i can't deny the third song si a bit difficult even when i'm used to hear this song.

They aren't bad, especially the braided girl but IU is just another level. Her voice is so well trained, is never shaken and dynamic + if you've listen to good day and you and I all the time then you just know. The third song was a little confusing because she didn't get good lines to sing.

As expected, Shannon. Her thin high notes are crazy! I loved her Why Why!

It's easy to find iu's voice. Her unique techniques and voice can't be duplicate by anyone 💖 shanon has amazing visual and voice, she really fight for her dream.

It's easy, IU has unique voice ❤️

IU's voice and vibrato is just too distinct, they all did great though. Im sitting here like people can't actually be having a hard time telling the voices apart right?

As an IU's fan, im proud of myself that i can tell which one is IU just by her voice 😍 their voices are simillar but different especially when they're all outside the box, i can tell by closing my eyes

Hoookeeedd!! How fun. I love how everyone in the room is interacting.

I've watched this episode many times, and Jett is surely the only one that has almost the same voice as IU, at least for me. Maybe that's why she got the high notes for Good Day. And by Jett I mean Shannon. I also got confused between 1 and 4 on 너랑 나 at first

IU my favorites singer since her first debut 🥰😳 Shannon, it's been a while 🥺

I love listening to IU's songs, so when they start hitting they're high notes that's when i can clearly tell where she is😁😁

wow my guess was right!! and i shocked that no 1 singer came out..Shannon William..i didn’t even think of her voice would be really similar to IU’s.. Until i watched these 🤭 good job 👏

I found IU each round. IU's voice is so hard to imitate. Her voice has this sound that only her can do. Ever since I listened to IU's song 2019. I've been a fan ever since. 🥰

After the first song it was a bit confusing cause the song was so weird. But after the second you can tell immediately it's her. Her foundational voice sounds like a mature adult woman, but has the light air of a bubbly young girl. But neither squeaky like a young girl nor super deep and husky like an older woman. It's like the perfect balance

Jett's voice actress from Valorant was the one wearing red hat here! She has amazing vocals!

So happy got them all right ,love her and her voice , it is so distinct

My picks were always Shannon or IU. Their mixed and chest voice sound alike 😍😍😍

they can't beat low voice version IU 💕

Jesus Christ, I'm having goosebumps listening to them singing

That girl with a hat showed me who IU truly is. She has definitely a background in classic music because the way she breathe is perfect and made it so obvious because this is IU's weakness throughout her career she sometimes breathe in the wrong pattern and make her voice stiff. That perfectness always point me to the correct IU 😂

at boo i guess it was 3 or 5 but when she sang good day i know it must be 5 💜 i wish shannon girl and other girls ll be succes in the future their voice is so beautiful

shannon deserves so much more.. it's unfortunate she didn't get to do more

All my guesses are correct✌ IU’s voice has its own charm😘

I listen to IU every single day. The moment IU started to sing I already knew it was her.

I was rooting for Shannon when I heard her single Why Why back then. She was featured on 'My Neighbor Charles' and I thought her work would pay off in Korea. It was so sad to watch her struggle for relevance and prove herself as a "foreigner" while dealing with mismanagement.

Honestly, I guess it right. I knew her high pitch well. Proud fan here.

Omg. Got it all right. 😍😍😍😍😍❤️❤️❤️❤️ Iba ang buo ng voice ni IU. Not too airy and not too deep

I just love that the lyrics is all (others are almost) in Korean and the vibes of her music is like the usual songs but the others are also trendy ,I'm not a fan so I can't distinguish who is who but their vocals are all amazing, imagine being IU or sounded like her🥰

iu has a very distinct voice .. you can easily differentiate her voice from the others

Shannon Was Awesome! One of My Favorites 🥰

She's #3 for Boo (1st round) There's another upload where she comes out from door 3 😊❤️

immediately knew it was 5 - she just holds those notes so well

Too easy IU voice is too distinct once you here it

If any of you play Valorant, the woman in the red hat voices Jett now lol

Shannon Williams 🔥🔥🔥🔥

Even as a lowkey lowkey fan of IU. I can distinguish her. Haha. She's ssssssssooooooo cute! She's the artist but she looks like the most shy one. Melts my heart. PS Edit: English Subs Plz.

IU “ah” and “ee” sounds are much more prominent and clear with a metallic background to them that is very specific. The others did a really good job though! 👏😍

This video only proves how unique IU's voice is🤣It's so distinctive that I guessed right everytime with ease

As a fan of IU since I was 10 years old, I could never mistake anyone else’s voice for hers!

Even though I don’t listen to IU’s song everyday, I can still find her because her voice is so unique that it’s hard to copy. But I do listen to IU every week though 😅

You might confused with their voices but IU’s technique gives it away

I already found her in the first round HA-HA. IU's voice is so unique that even I close my eyes I can still find her by listening to her angelic voice. 😁

She's so pretty and so talented. IU is an amazing artist.

I did it!!! I guessed every round right 😭🙌 I've been a casual listener since 2013 and there has never been really any singer I've known that sounded identical as her. IU has one of the most unique voice in the industry...her style/technique may be imitated and the other singers did pretty well here but there's just something so distinct only her delivers

If you’re Uaena, easy to choose where’s IU… Her voice is to special, no one can’t copying her 😁

Shannon ❤️

I got all correct😌 since she has unique combination of both bold and sweet voice🥺

Supe siempre en que lugar estaba, IU tiene una voz inconfundible dulce, poderosa y sin aire. Este programa expone a los artistas a ser comparados con otras personas que cantan bien, pero deja en claro porque ocupan el lugar de ser grandes !

I just watched this for the first time and as a voice mentor i can easily guess who’s the real IU her voice got the unique color in it

I think IU has a very unique voice and its very hard to copy. These singers had done such an amazing job

The power in IU's voice 💜

Wow the another singer are all amazing

I am not that big of an IU fan. And I don't mean to discredit the other singers. But I was also surprised by how easy it is for me to differentiate IU's voice. well, IU's good day had been playing on loop for months on my phone 11-12 yrs ago. Her voice in that song had been engraved on my ears. same as her marshmallow. hahaha

Shannon was too youngggg and talented. It's a shame she missed a good company :"< but she's happy now doing her streamer life, right?

This was amazing

Acerté todas y es que su voz tiene algo muy especial y distintiva. Mi solista favorita sin dudas 🥰

The red hat surely good, almost thought she is IU, IMHO IU's voice is a litle bit easy to recognize.

Wow....all are amazing singers!

I find her everywhere and I am so proud of myself😄Love you IU💓

One of my fav solo artist IU😍😍😍

3 and 4 was pretty good. I was pretty convinced it was either one of those until the last song where 5 sing the high note. After that I was pretty dead on 5. I just feel the way she sings her high note r quite hard to imitate.

I knew it right away,she's in no3 in the first song,then 5th in the next song

I really hope someone subs some of the later episodes of this show because I truly love the concept.

I can recognise people with their voice so it was easy to guess.. also I'm a fan for her(IU). I usually don't recognise people by their face unless they are in the same dress and same make-up. "Love Poem" is my favourite ❤️

Shannon was no 1 & she somehow got the tone of IU is amazing. Miss her tho

i miss these kind of shows!

I know the soft and cleanliness of voice ni IU and also the range ng boses nya hindi nag aalangan kaya na hulaan ko lahat... Fan talaga ako ni IU... Love you IU

Everyone sounds sooo goood, im jealoussss🤣 Nonetheless, I can find IU quite easily, but it’s prob different in the studio.

Wooah all great vocalist packed in 1 stage

They are all beautiful 😻

IUs voice is very distinct. You can easily guess who's who especially when reaching high notes.

Even after so many years I still think IU is pretty much Boa's successor.