- 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 — S1E7
Episode: Let's Be Partners?
Air Date: 2015-07-13
Runtime: 61 min
Overview
Lee Hyun confronts Cha Ji-An about her doubting him and thinking he may be like Lee Joon-Yeong. Lee Hyun believes Lee Jung-Ha is covering for Lee Jin-Woo. Teams 1 solves the Park Jeung-Woo murder case. After doing some soul searching, Cha Ji-An comes to the conclusion that she is wrong, and Lee Hyun is not like Lee Joon-Yeong. She tells him that he is weird and annoying but not a monster. After solidifying their partnership, she asks him out on a date and takes him to a closed amusement park to spend time together.