The Equation of Love and Death

Limi is a cab driver on a search; she's been trying to find her fiancé, Fang Wen, who disappeared from her life suddenly after her disapproving parents broke off their pending marriage. For four years, Limi has been receiving letters from Fang Wen randomly, all sent to her without a returning address. Unable to let go, Limi keeps his photos tucked in a magazine, showing them to every passenger that boards for a ride, hoping one day, she might run into someone who will give her a clue. Qiu Shuitian is a small time crook from the countryside of Yunnan. He, along with his partner, Qiu Huogui, arrive the big city with hopes of striking some gold to bring back home. But at the same time, Qiu Shuitian secretly has another agenda, he is also searching for a girl who has left their hometown to work in the city, the girl he loves and intends to spend the rest of his life with. Feifei is a recovering drug addict who has found support through her lover and business partner, Ma Bing. Despite her dark past, Feifei sees light in the future ahead, and she patiently waits for the emotionally closed up Ma Bing to open up to her, providing her with the answer to the dream of a new life. When a mysterious death occurs, the lives of these unexpected strangers are suddenly intertwined together. A drug trafficking crime is unveiled, and through the twist and turns of the investigation, their stories unravel, and a bizarre connection is gradually discovered between them.