Unexpectedly, the reason why Gao Jun was fake was to get closer to Ruan Zhenzhen.

Gao Jun is a character in the TV series "Unexpected Arrival". In the TV series "Unexpected Arrival", the tall lawyer Lao Yan introduced to Su Wen and Ruan Zhenzhen is really Gao Jun, and the real Gao Jun hired Tan Shen to let him

Tan Shen pretended to be Gao Jun to get close to Ruan Zhenzhen in order to investigate the cause of Xu Youning's death and the unknown inside story of Jinshang Fund Company.

Gao Jun is played by Peng Guanying, so unexpectedly Gao Jun is fake because he wants to get closer to Ruan Zhenzhen.