Mnet's 'M! Countdown' is back for its weekly show featuring performances by your favorite artists!

On this episode, B.HEART debuted with "Realistic", and Kevin Oh debuted with "Stardust".

As for the winners, Seohyun and Akdong Musician were nominated for 1st place, but it was Seohyun who took the win with "Don't Say No"! Congratulations to Seohyun!

Other performers of the night were Kang Sira, Niel, Dream Catcher, Seohyun, CLC, Ravi, SONAMOO, I, Hello Venus, VARSITY, AOA, NCT 127, Cosmic Girls, Walwari, Vromance, BP RaNia, Shin Gi Won, April, and HighSoul.