Rebirth and Symbiosis with the Demon King

How long does it take to change from a woman to a man? Some people say that this surgery cannot be done in one go. It will take several months, right? No, Zhang Xiaotong tells you, don't go to such trouble, just go to the underworld and come back changed. Not only did she become a boy, but she also brought back a demon king. Lonely passed through many levels of the underworld and swallowed Xu Yifan's yang soul so that he could use his body to resurrect his soul. Unexpectedly, he was accidentally trapped in the soul of a woman and never saw the light of day. So a woman and a devil entered Xu Yifan's body together, then what will happen next... This is a series of things that happen when two souls share the same body.