The aloof and taciturn demon slayer × an old monster who has lived for thousands of years and likes to pretend to be an ordinary person.
Xu Jiechen, a modern exorcist who is cold and taciturn and abides by the rules, has made it his mission to slay demons and eliminate evil throughout his life, but he always gets entangled with You Chong, an ordinary bookstore owner who seems to be carefree.
The other party was obviously powerless, but he always appeared in time when he was seriously injured by the monster, and helped him resolve the crisis with ease, and even remembered many of his little habits that he had almost forgotten.
Xu Jichen was always on guard, believing that the other party was definitely an ordinary person. It wasn't until one time that he was in a dead situation, and You Chong revealed his true form to protect him - only then did he realize that the man in front of him was a great demon who had lived for a thousand years, and his cultivation was unfathomable.
Concept: Fate is a shackle, choice is destiny