Ji-sung Koo and Kim Sang-hyuk, tough ties? "Stop cutting." on August 21, 2021 Friendship Ji-sung Koo Kim Sang-hyuk Model +
"When Is This" Jeong Ga-eun, 14 Years Ago Recall...Beautiful looks While Ji-sung Koo also Acknowledged on May 26, 2021 Beautiful looks Jeong Ga-eun Ji-sung Koo +
Choi Siwon - Lee Jin-wook, 'Smiles of Hunnam' on June 07, 2018 Choi Siwon event Ji-sung Koo Lee Jin-wook +
Krystal Jung 'Simkung Eye Contact' on June 06, 2018 Busan Exhibition and Convention Center Ji-sung Koo Krystal Jung +