Yun Jian You Zuo Cheng

Qingai Estate sits majestically in the clouds, with philanthropy as its duty. One day, there was trouble in the mortal realm. Master Ci Xiang waved his young disciple over, "Go report to the Changce School tomorrow. If anyone asks, tell them you're sixteen." Feng Qianshui tried to walk away from the mission, but he was the only disciple who could pass for a young student, so he was forced to return to school. The Master told him, "Be sure to take care of Xie Ren, and help him back onto the path of the righteous." Xie Ren turned to be powerful, but he was also a weirdo with a bad temper. While the other students were still learning to gather their qi, Xie Ren created a big fireball with just a slap on the table. On his first day, Feng Qiangshui just had all his things burned to a crisp: Well, this fire just burned up our relationship. If I can't help you to be good, then I'll just have to destroy you…

(Source: Bilibili, translated)