S1, E5: Hou Chi promises Shi Xia that she can be sent home once he is the lord of the Ten Thousand Immortals. In the meantime, Shi Xia promises to be his sister if Hou Chi could agree on 3 rules. During practice, Shi Xia learns the tree Hou Chi practices on is wilted. Shi Xia wants to fix the tree and asks Bi Hong for help.