Doyoung & Haechan ft. Mark sing Cinta Luar Biasa by Andmesh Kamaleng with Mark playing guitar
Taeil sing a lil bit too

Video is not mine, I just edited (merged)
original video :
• Mark & Haechan VLIVE 2020.09.02 (Letter of Apology 2💚)
https://www.vlive.tv/video/211007
• NCT Daily
   • Kuy~(?!) Ayo belajar Bahasa Indonesia...  
   • Kuy~(?!) Ayo belajar Bahasa Indonesia...  
• Doyoung VLIVE 2020.05.07 (Let's Talk a Lot💚💚💚)
https://www.vlive.tv/video/190167