After his brother and mother were both diagnosed with schizophrenia,  Li Jia who bears the immense mental pressure of inheriting their family genes resolutely decides to go to Hong Kong for his studies. While house hunting, he meets the quirky Zhang Cha Cha and human anatomy student Shi Cheng.

While searching for a place to stay, Li Jia meets Xiao Xi who is known as the 'sharp master'. Xiao Xi was born with a gift since he was a child and he now has two apprentices. Through a series of events, Li Jia and his friends continue to run into mysterious 'strangers' and become involved in their intricate stories.