Episode 4 S01 E04

Ju Sang-uk (as Han Tae-hee) Han Ye-seul (as Sara / Sa Geum-ran) Jung Gyu-woon (as Lee Kang-joon) Wang Ji-hye (as Gyo Chae-yeon) Han Sang-jin (as Han Min-hyeok) Ha Jae-sook (as Sa Geum-ran (Past)) In Gyo-jin (as Gyo Ji-hoon) Han Jin-hee (as Lee Jeong-shik) Kim Yeong-ae (as Go Soon-dong) Kang Kyung-hun (as Lee Jin-young) Jin Ye-sol (as Lee Min-young) Kim Yong-rim (as Mrs. Park) Shim Yi Young (as Eun Gyeong-joo) Kim Chung (as Son Ji-sook) Lee Jong-nam (as Shim Yeo-ok) Kwon Hwa-woon (as Team Leader Choi) Choi Jong-hwan (as Manager Kim) Jo Yeong-hoon