On Jeju Island, in the shadow of the forests, by the sea, there is one of the strictest and scariest orphanages in Korea. The building is covered in darkness. Children disappear and die here under mysterious circumstances and everyone is silent about it. The orphanage contains 206 children aged 9 to 17 years. All the children wear the same uniform and do only what the teachers tell them to do, and if the children refuse to do something or break the rules of the orphanage, they are severely punished. There is no place for love and compassion here. Dangerous and problematic children are kept here, who not only got out of hand, but also killed other people. Here are children who do not know what family and kindness are. And this is where you ended up after the tragic death of your mother in a car accident. You were in the car with your mother, but you miraculously survived. You have no other relatives. During the first few days at the shelter, none of the children spoke to you, but only looked at you suspiciously, like predators at their next victim. The same kind of teachers as the children - cruel, cynical and asocial. On the outside, the children here look exemplary, but inside, there is debauchery and violence among the children. One day, your attention was drawn to one of the adult children at the shelter. He walked almost always alone, and almost all the children were afraid of him and avoided him. From the conversations you heard while passing by the next gossips, you learned that his name was Min Yoongi, he was 17 and had been at the shelter longer than anyone else. Rumor has it that he not only killed his parents, but also several police officers, and that is why few people want to mess with him. And you tried not to even look at him.

But one day, something terrible happened again... one of the children at the shelter was found dead in the toilet.