@Guntai It only started with the need to cure the poisoned old general from the house Na Lan, in order to get the rare ingredient (which the thief stole, though). Since Xiao Yan can't forgive Na Lan Yan Ran, he couldn't go there with his own identity. It would be weird to go help the family he's supposed to despise, plus it'd have most certainly created needless drama. So, it was easier to go using a fake identity. However, since that fake identity became mega popular, the Miteer trade house wanted to use it for profit, so he's stuck with it for the time being.