Choi Hae Kab (Kim Yoon Seok) has been a leftist activist since his university days and having a wife (Oh Yeon Su) and three children hasn’t stopped him from fighting the man. He makes documentaries about social issues, thumbs his nose at the government and raises his kids with a devil-may-care attitude. His children are used to his eccentricities at this point. Hae Kab doesn’t mind if they don’t go to school and he doesn’t worry when his son Na Ra (Baek Seung Hwan, Silenced) runs away from home. One day, Hae Kab’s old friend Man Deok (Kim Sung Kyun) shows up with bad news: their hometown, the southern rural island of Deul, is being sold to a resort developer. With a new fight ahead, Hae Kab picks up and moves the entire family back to Deul for a back-to-basics life.

Strange rumors start to spread at the catholic girls’ high school after Unjoo committed suicide one night. Unjoo’s younger sister Jung-un who attends the same school gets suspicious about Unjoo’s death. After persistent investigation, Jung-un finds out that on the night of the incident, Soy, Eugene, Eun-young, Unjoo, the four of them had tried to commit a joint suicide after making a vow on blood. But the three are still alive, and only Unjoo had died. the desire, jealousy, and lies behind the pledge of death between the four girls are revealed, along with the hidden truth behind Unjoo’s suicide.