The wife receives news that her husband, Xiao Li, lied about being away on a business trip, but appeared inside a villa guesthouse. She takes her younger brother and pet dog Doudou straight to the guesthouse to catch him cheating. Starting from rushing into the guesthouse to catch the affair, a series of misunderstandings and bizarre phenomena unfold one after another: kicking open the wrong room and running into a strange couple, a drunk stranger popping out of the wardrobe out of nowhere, and weird occurrences happening frequently in the unfinished empty room on the third floor.