Tang Ren and Qin Feng travel to Japan to investigate the death of a mafia head. As they suspect foul play, they engage in a battle of wits against foreign detectives.

Bei Xiaobei is a self-abased writer because he feels himself too fat. Because of his poor appearance, he often ran into a wall in real life. Later, he unwittingly finds a long dusty family tree and accidentally crosses through the ages to meet with his ancestors.