The Grey Men.

The film's story unfolds in the fictional country of Laika and in Hong Kong, China. A police academy student who has not yet graduated, Ashan (played by Gu Bin), is tasked with a dangerous mission. He helps the criminal organization by eliminating obstacles for their leader, Atian (played by An Zhi Jie), in prison. Ashan approaches Atian, gains his trust, and collects evidence against the criminal group. After both of them are released from prison, Ashan assists Atian in rising within the criminal organization in Hong Kong. After enduring numerous challenges, Atian successfully replaces the group's leader, Bao Ge (played by Zeng Zhiwei), becoming the new boss and taking control of the organization. However, just as Ashan is about to complete his mission, his true identity is exposed.