I Really Want to Die! Challenge the Villain Sister at the Beginning

I, Li Changge, will become invincible after death. I am crazy about dying, but I can't die no matter what. "Changge regards me as more important than his life. I must not let him suffer any harm, and I must let him achieve immortality just like me." "I am a poisonous body of disaster. My family died because of me. The world hates me. My world is dark, but the appearance of Li Changge brings me a gleam of light." "My disciples have all become powerful demons in the world. I was plotted and hunted by them. No one dared to help me. They were all afraid of the demon. Only Li Changge..." ... I, Luo Nichang, appear to be extremely talented, but in fact I am a loser in cultivation. I am also the villain of this world, and I end up dying tragically. I don't want to die, but because of Li Changge, I am becoming more and more dangerous. The horror protagonists are all targeting me. Help! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.