That interesting especially with how consistently he's using it .....definitely missed that when I heard him on couple of occasions, most of the compilation is hv ans supported apart from some Oo's on D5s those were falsetto, I would give a pass on some D5s so he has C#5 or C#5/D5 (He also remind me of the late jonghyun face wise 😢) ,good Job on finding all those (that why we need this community to still be around ) yt format is still imo the most objective platform for vocal material (tiktok is infected by certain individuals 💀 let be real )