I'm Not an Evil Male Supporting Character [Book Transmigration]

Li Shu, a straight guy, inexplicably transmigrates into a danmei novel and becomes a vicious male supporting character who goes mad for love. In the end, he dies with a sword through his heart after trying to kill the shou! What kind of ridiculous plot is this? Li Shu is speechless. "To hell with your love and hate. Danmei can go haunt somebody else." He likes sweet, gentle girls, and he's resolved to stay away from the male leads and focus on cultivating immortality. But things don't go as planned. Trouble keeps appearing out of nowhere, and little by little, Li Shu realizes something is wrong. Maybe things aren't as simple as he imagined? Theme: Even in darkness, keep your heart turned toward the light