She's 16, and she just found her best friend in life, he's 60.

A street-kid, a retired policeman from Mainland China, a dysfunctional family, drugs,the triad..... and a missing girl. This is a tale of.... well, growing up. WU, an ex-china police who lived in an outlying island which was a former fun-park. Wu has very bad relationship with his daughter and daughter-in-Law. The story starts with this lonely retired policeman comes to the busy Hong Kong island to search for his missing granddaughter, Ah Cho.

For the purpose of this search, Wu encounters P, a street-kid who claims she is Ah Cho's debtor. P initially rebuffs Wu just like any 16 year-old would rebel against the older generation. Unfortunately, there is simply no escape from the apparently omnipresent Wu. It takes a few adventitious incidents for P to soften up. P's boyfriend, Tofu, join in their search but also bring many unwanted incidents such as the trial and drugs.

P leads Wu into a series of strange encounters in the uncharted world of frustrated youth. P find the brave of being grown-up from Wu , meanwhile, Wu rediscover the essence of living from P's adventure.

Although they begin to understand each other, Wu just find out P has been hiding his missing granddaughter all along. With a history of leaving home, Ah Cho this time again leave for no notice. Both of them discover that finding Ah Cho will probably be impossible after all.