What is the end of the city hunter?

At Jin's funeral, Zhang Bi searched for the official road and revealed the truth that Runcheng was an urban hunter. Through various clues, the president knows that Runcheng is his own flesh and blood, and he gives Runcheng the records of illegal transactions he handled during his campaign and taking office, hoping that he can handle them in his own way. Runcheng delivered 1983 confidential documents and the president's transaction records to the media, and Congress announced the impeachment of the president. At this point, the real tiger is ready to start the final execution. Before the impeachment meeting, Zhen Biao came to the meeting. I didn't expect Runcheng to be the first. The two men pulled out their guns, but Runcheng failed to persuade them. So Zhen Biao remained indifferent. Just as Runcheng was about to pull the trigger, Nana protected the president. The president felt deeply that this matter needed to be understood. He pushed Nana away and wanted to accept Zhenbiao's sentence. Runcheng finally chose to protect his biological father and act as the president. Nana saw Runcheng fall and shot Zhenbiao. When she heard the gunshot, the guard outside the door came in and confronted Zhenbiao with a gun. Zhenbiao assumed the behavior of a city hunter and was finally shot. At the end, Dahui opened his own coffee shop, married Gao, and Nana resigned. Nana in Runcheng smiled at each other on the bridge (presumably she went to America with her mother and uncle).