After losing his only son, Old Kim establishes Haksagol, an all-male boarding house. Admission requires a strict exam and interview, and anyone who breaks its ten rules—such as bans on drinking or protests—is immediately expelled. This year’s top entrant, Jin-young, is secretly a female law student disguised as a man. As she struggles to hide her identity, unforeseen events begin to shake the foundations of Haksagol.
| Actor | Role |
|---|---|
 Kim Seo-raJin-young | Jin-young |
 Lee Jin-suDoo-tae | Doo-tae |
 Choi Jae-sungSun-woo | Sun-woo |
 Park Jun-gyuSeok-gu | Seok-gu |
 Kim Seung-hwanJae-hak | Jae-hak |
| LLee Keun-heeNot listed | Not listed |
 Kim Eul-dongNot listed | Not listed |
 Jeon Kuk-hwanNot listed | Not listed |
| NNa Jae-ungNot listed | Not listed |
 Lee Hae-ryongNot listed | Not listed |