Here’s MY opinion: 0:15 Eunseok as Giselle and Seunghan as Ningning 0:37 Anton as Ningning 1:30 Eunseok as Karina 1:31 Sungchan as Winter 1:45 Sohee as Ningning(A lot of “How would” videos don’t let Sohee rap. He rapped in Siren and Memories) 1:53 Seunghan as Karina(I can’t imagine Eunseok singing like that to tbh lol) 2:00 Wonbin as Ningning is perfect but Anton as Giselle’s ad-libs, “neon” and “now”) 2:30-2:34 Sohee as Winter’s ad-libs 2:35 Seunghan as Ningning 2:38 Anton as Giselle’s ad-libs(In the song, “Love 119”, Anton has ad-libs and a beautiful falsetto making him a Lead Vocal Material) 2:41 Wonbin as Karina’s ad-libs.