Episode 4 S01 E04

Sung Yu-ri (as Jung Yi Hyun) Kal So-won (as Hong Hae Deum) Yu Jun-sang (as Hong Kyung Doo) Choi Su-rin (as Jung Joo Kyum) Yoo Hye-ri (as Mrs. Choi) Park Eun-ji (as Kwang Sook) Lee Jin (as Lee Sun Young) Han Min (as Park Soo Chang (Young)) Jeong Seok-yong (as Tae Man) Jo Mi-ryung (as Shim Yeon Jung) Lee Hyo-jeong (as Choi Suk) Lim Hyung-jun (as Tae Soo) Shin Seung-hwan (as Jong Tae) Kim Kap-soo (as Choi Gook) Han Sang-jin (as Choi Ki Tae) Kim Young-kwang (as Park Soo Chang) Seo Hyun-chul (as Go Eun Pyo) Jin Hyuk (as Choi Ki Jung) Kim Hye-jin (as Lee Hye Young) Son Jong-hak (as Jeju Island chief) Ko In-beom (as Executive Director Lee Joo Ho) Kim Jung-soo (as Senior Soo Chang) Kim So-hyun (as Jung Yi Hyun (Young)) Lee Hyang-sook (as Lee Sun Young (Young))