Namjoon's Mom tell Namjoon that Mr. Kim means Namjoon's father is having an affair with a young girl, and Mrs. Kim want to remove the girl from Mr. Kim's life or else she will be unable to live her life. Namjoon promises his mother that he would remove the girl from his father's life and punish her. How will Namjoon punish the girl who attempts to end his parents' marriage?