I Can't Run Away After Flirting with a Sick and Weak Guy by Mistake

Logic online: The revenge heroine thought she was taking advantage of a sick chess piece, but she didn't know that the opponent was the BOSS behind the scenes who had been pretending to be sick for three years. The identities of prey and hunter were reversed in the ending, but she could no longer run away. She thought she was on the fifth floor, but it turned out that he was in the atmosphere; by the time she realized what she was doing, he had locked her to death at the bottom of the pit.