Not everyone can see Emperor Ying Yuan, but Mo Yu has just come of age, and with the black soil in Mo Yu, he can't become a man at first during the day, so he has never seen Ying Yuan or a wick.
Mo Yu, an ancient relic, was named Mo Yu because yan dan unexpectedly turned into a human being in the celestial world. From then on, Yan Dan deeply penetrated into his bone marrow.