Lawyer Meng Zhong (Huang Xiaoming) has been obsessed with fighting for the underclass for years. He takes on a case of molestation of a young girl and at the same time gets close to a young girl, Wei Xian (Wang Yinglu). As the investigation progresses, Meng Zhong is followed and threatened by a mysterious person who threatens to publicize the crimes he committed when he was young. It turns out that Meng Zhong, who failed his law exams years ago, used to drive a night-shift taxi to earn a living. Late at night, on a seemingly normal day, a mysterious passenger comes into his cab, who seems to have some kind of connection with Wei Xian. ......