I Became the Foolish Older Brother in That Novel

Twelve-year-old Chae Yunho, who thought the girl he had a crush on was his first love, realizes that she is actually a boy. Before he can even mourn the loss of his first love, he realizes that he has entered a novel. And not just any character, but the foolish older brother who bullies the protagonist, Choi Haejun, abuses him along with their mother, and eventually digs his own grave and dies. After realizing this, he stops doing foolish things and tries to live his own life without interfering in the protagonist's life. However, he can't ignore the fact that Haejun, who is only eight years old, is being abused. He tries to change the protagonist's life just a little, but his own life is c...