Following King Yan's will, Bai Wuchang reincarnated for ten lives to experience human nature, while Hei Wuchang Tang Qian stayed by the Naihe Bridge for nine lives. For some reason, Bai Wuchang's ghostly energy overflowed, and his mortal body might be fatal. So even if he violates the rules of the underworld, he must protect him.
Intention: If you get used to being in a cage, this cage will become the whole world. Being locked up is not scary, but you are afraid of being locked up without knowing it.