Se-ha who is physically handicapped and Dong-gu who is mentally handicapped are not their own brothers. But while living 20 years together, the two became indispensable to each other. One day, the mother of Dong-gu suddenly visits him and acts as his guardian.
| Actor | Role |
|---|---|
 Shin Ha-kyunSe-ha | Se-ha |
 Lee Kwang-sooDong-gu | Dong-gu |
 EsomMi-hyun | Mi-hyun |
 Park Cheol-minSong Ju-sa | Song Ju-sa |
 Kwon Hae-hyoPark Sin-bu | Park Sin-bu |
 Kil Hae-yeonJeong-sun | Jeong-sun |
 Kim Kyung-namTeacher Yook | Teacher Yook |
 Ahn Ji-hoYoung Se-ha | Young Se-ha |
 Kim Hyun-binYoung Dong-gu | Young Dong-gu |
 Kim Han-naLake Woman | Lake Woman |
 Kim Min-seokWild Boar | Wild Boar |
 Woo Ji-hyunAhn Nyung-yi | Ahn Nyung-yi |
 Yang So-minAttorney Han | Attorney Han |
 Kim Seo-wonUnemployed Man | Unemployed Man |
 Kim Hee-changConvenience Store Owner | Convenience Store Owner |
 AndUpRapper | Rapper |
 Kim Ki-cheonTaxi Driver | Taxi Driver |
| SSun Jong-namInterviewer (uncredited) | Interviewer (uncredited) |