Yi Qingyi, the head of the 666 Gates, is known as the best detective in the world. He can solve strange cases in the world within a stick of incense, and is nicknamed Yizhuxiang. However, he has suffered a blow due to a case of a lost sheep, and has never recovered since then. Unexpectedly, this problem is easily solved by the new detective Wu Jiujiu. As a fan of Yizhuxiang, Wu Jiujiu firmly chooses to form a master-disciple partnership with Yizhuxiang. The two of them have become walking "explosive joke output machines" and vow to be "funny" to the end.