Seo Ja-yeong

Seo Ja Yeong participated as the singer of "Feel" and "Quixotic" on the "Lies of P" game OST.

Seo Ja Yeong performed "Shallow" (A Star Is Born OST by Lady Gaga & Bradley Cooper) and "Love Yourself" (by Justin Bieber) during episode 7 of Mnet/tvN'srnvariety show "I Can See Your Voice 7" on February 28, 2020.

Seo Ja Yeong performed a cover of "Someone You Loved" (by Lewis Capaldi) and "Psycho" (by Red Velvet) on the "gru:v" YouTube channel in 2020.

Seo Ja Yeong performed "Wine" (오늘 취하면) (by Suran, Changmo, prod. Suga of BTS) and "A Night of Counting the Stars" (별 헤는 밤) (by Kim Dae Young) with Choi Yuree during episode 4 of Mnet/tvN's survival show "Folk Us" on December 11, 2020.