Tung Tung just graduated from the police academy, encountering a Vietnamnese assassin on his first day on work. Tung in order to break through obstacle in his mind decides to join SDU. Among the teammates, Coolman feels resentment toward Tung, which he doesn't understand. Later he discovers Coolman is actually his step brother. Tung actively tries to get close to Coolman, but is rejected. When training reaches its last stage, Coolman and Tung's team reencounters the Vietnamnese assassin on a deserted island.

Hangzhou, China, the present day. Chen Congming, an associate professor at a medical college who is popular with his students, alarms his superiors with his theory that everyone has the potential to go crazy, and that the dividing line between sanity and insanity is paper-thin.

Lucky Coffee Shop is well-known for its egg tarts and tea. Waiter Sui, named as Prince Egg Tart, attracts lots of girls but only loves Candy. He and his friends, Nam, and Fok, all have love problems. At the same time, the coffee shop may collapse since the landlord is increasing the rent tremendously. Let's see how the lucky guys of the shop can revert this situation.