Raymond Lam, Zheng Kai play brothers on opposite side of the law in mystery thriller The Mask 也平凡.
When officer Ji Fan (Zheng Kai) begins investigating a series of murders, he connects the new murders to a 27-year-old case involving his family. After his father Ji Tingshan (Zhang Guolin) is captured for his involvement in the murders, his brother Ji Ping (Raymond Lam) flees abroad. There, Ji Fan tries to find hid brother while performing his undercover task to uncover the motives and identity of a gang. Things become even more complicated than he had thought as the two brothers becomes involved in an even bigger plot.