- Seo In-guk (Lee Hyun)
- Jang Na-ra (Cha Ji-an)
- Park Bo-gum (Jung Sun-ho/Lee Min)
- Lee Chun-hee (Kang Eun-hyuk)
- Choi Won-young (Lee Joon-ho/Lee Joon-yeong)
- Im Ji-eun (Hyun Ji-soo)
- Min Sung-wook (Son Myung-woo)
- Kim Jae-young (Min Seung-Joo)
- Jun Kwang-ryul (Lee Joong-Min)
- Son Seung-won (Choi Eun-Bok)
Hello Monster — S1E16
Episode: I Remember You
Air Date: 2015-08-11
Runtime: 64 min
Overview
Lee Hyun remembers his past of killing the murderer of his mom and the meaning behind Lee Min’s cards. Cha Ji-An tells Lee Min to turn himself in because it is wrong to hurt other people and if he doesn’t, he and Hyun will never have a happy ending. Kang Eun-Hyuk interrupts Lee Joon-Yeong choking Ji-An. Later, he tells Ji-An that he likes her. Hyun and Min spend time together to cement the bonding of brotherhood. Joon-Yeong is stabbed by one of his kids and then Min attempts to kill him. Hyun arrives after Min is stabbed but is knockout. Min and Joon-Yeong disappear. After visiting Ji-An three times, Hyun disappears. Choi Eun-Bok confesses to killing the Planning Officer and decides to be a witness against Joon-Yeong.