The Love of Immortal (2019)

Tianyi is well-known in Heaven for never getting a promotion. He's been a disciple at the Hall of Learning for many years and can't become an immortal because there is something from a past life of his that hasn't been dealt with. One day, he unintentionally releases the imprisoned Snow Demon and follows her to the human world. Without supernatural powers on Earth, Tianyi stays with the Snow Demon as a mortal and they fall in love. Learning that it's his own mistake in a previous life that made Snow Demon became what she is, Tianyi decides to wander for over 1,000 years on the road to the netherworld. Finally, Snow Demon sacrifices herself to save Tianyi.