Jun Gao and Tan Shen probably have a cooperative relationship, because it is very likely that Jun Gao really hired Tan Shen to pretend to be Jun Gao and approach Ruan to investigate Xu's death and the unknown inside story of Jinshang Fund Company.
At present, Tan Shen should be a "double agent". On the one hand, he took orders from Jun Gao and monitored Ruan for Jun Gao. On the other hand, he also wanted to find out the truth, ultimately, and find out the hidden interest groups behind the Xu incident, especially the big boss behind the real Jun Gao, which was the big boss that scared Fang Jian.
"Unexpectedly" has a happy ending.
In the finale of Unexpected Arrival, Ruan was kidnapped by Fang Jianshe and Jun Gao, and Tan Shen gave his life to save him. In the end, Gao Jun, Fang Jianshe, Shen and Xia Xinliang were all arrested.
Ruan sold the house, made up with Xu's parents, and then came together with Tan Shen. Shi gave birth to a child, and You Gang found a job again, so they decided to start over. Su Wen's blackening is fake. She got the evidence from Lao Yan and finally gave it to the police.