I Surrender is an original song by Celine Dion, performed by InGiHyunSang during the first round of quartets on the first season of Phantom Singer.

The members from right to left in the video are:
Park Sangdon: Baritone trained in vocal music.
Kwak Donghyun: Rocker.
Yoo Seulgi: Dramatic tenor trained in vocal music.
Paek Intae: Tenor spinto, trained in vocal music. Leader of the group.