What is the relationship between Bai Jingjing and Xia Zi?

The relationship between Bai Jingjing and Xia Zi is mentoring.

Bai Jingjing is the second disciple of Pan Si Daxian (Xia Zi and Xia Qing). His ancestral home is Bai Gujing, and he has always been obsessed with the Monkey King. Bai Jingjing sublimated the spiritual world of the Supreme Treasure.

Xia Zi and Xia Qing were originally intertwined wicks of the Buddha. They fought fiercely in their previous lives, so the Buddha rolled them together and turned them into wicks, asking them to practice hard to resolve this feud. Unfortunately, it backfired, which led to more fierce fighting than before. In the movie, they both use the same body, Xia Zi in the daytime and Xia Qing in the evening, and take Chunsanniang and Bai Jingjing as apprentices.

Extended data:

After the Great Fairy of Pansi settled in Pansi Cave, many people came to learn from the teacher. However, fairies are very strict with their disciples' roots and only accept women.

Bai Jingjing and the teacher elder sister went to Tang Priest to eat his meat, but met the supreme treasure reincarnated by the Monkey King. Because he couldn't forget his love for the Monkey King, he saved the Supreme Treasure from the elder sister, but he was poisoned.

After that, the Supreme Treasure left Bai Jingjing to find an antidote. She thought the Supreme Treasure was a fake and jumped off the cliff. Niu Wangmo saved her and forced her to lead the way to Pansi Cave. She was deceived by the elder sister, thinking that Supreme Treasure was having an affair with Chunsanniang, and committed suicide in a rage.