This Snake Monster Makes Me Feel Uneasy

[Two male protagonists/Main plot/Group elements/Sour and sweet story/Strong redemption] You want to eliminate all demons in the world, but have you considered your own calamity? The two things that caught Shen Wenlan most off guard in his life—— One is to follow the sloppy master back to the sect and be treated as a beggar. Second, he failed to get rid of the demon but became a wanted criminal, and he also picked up an enemy with a black robe and dyed clouds. The junior brother thinks he is a fool, and the master suspects that he is a member of the devil's sect. That man didn't know money in the world and used it as a hidden weapon to hit dogs on the head. However, when he was about to die and was being tortured, he would break into the prison at night and say in a hoarse voice: "Your life is mine, you are not allowed to die." Shen Wenlan disappeared, and the entire imperial city was crushed into ruins by demonic power. Later he found out—— The person who always followed him and called him brother, his real name was Ye Xuanqing, and he was actually the monster he wanted to kill. Before the battle to kill the demon, Shen Wenlan blocked the fatal blow for his opponent. In a trance, I heard mournful cries resounding through the sky: "You say the demon has no heart, so what does this heart-cutting pain mean?" A few months later—— The resurrected man held his sword against the throat of the new demon king. But when the memories came back, his pupils trembled: "Your injury... Why does it hurt my heart?" Ye Xuanqing touched that face and burst into tears from laughter: "Idiot, even if you want to die... You have to choose the most painful path." Duanfang Daojun×Future Demon King｜Entangled love｜Reincarnation of life and death "You teach me kindness, and I become a devil for you." Ps: Fairies, please don't be scared by the introduction. It is a sweet story, the emotional line is not cruel, and each other is sour for each other. I can't write an introduction.