Xie Chao is a lay disciple of Shanwai Temple, and Ye Zhigui is the Lord of the Demon Realm.
When they first met, they didn't know each other's identity, so Xie Chao rescued the trapped Ye Zhigui.
Ye Zhigui said: You saved me, how about I promise you my life?
Xie Chao replied: Disciples of Shanwai Temple cannot get married.
Later.
Xie Chao asked: Didn't you say that you wanted to pledge yourself to me?
Ye Zhigui: The Lord of the Demon Realm doesn't want a family~
Note:
It's probably a background of cultivating immortals, but there won't be anything like various realms.
There are a lot of vernacular texts, and stupid authors can't write dialogues with that kind of ancient charm.
Intention: None.