Red Yaksha

Before he can avenge his younger sister, the school bullies responsible for ruining her life die unexpectedly.
Refusing to let death rob him of his revenge, Lee Seong-yul takes his own life and descends into the underworld, determined to hunt them down.
No matter how deep they hide in the endless layers of hell, he will chase them to the very end and make them pay for what they did to his sister.