Who can explain the ending of the city hunter to me? A little confused?

Runcheng took the prosecutor's mobile phone and found that the short message that the prosecutor received from the so-called city hunter was actually sent by his adoptive father. Runcheng asked his adoptive father why he sent this short message. The adoptive father said that it was necessary for him to participate as a prosecutor, and told Runcheng to clean up thousands of things now. When Runcheng arrived at the dock, Qianzai Wan was already dead. Run Cheng opened the secret document and saw the five-person gang inside, and finally the president was left, which means that the last person he had to deal with was his biological father. Runcheng asked his adoptive father about dealing with his biological father. Runcheng investigated and exposed the illegal problems of presidential election funds, but he decided to protect the president's life and opposed his adoptive father again. The adoptive father shot at the president, and at the critical moment, he stopped the shot for the president. . Nana saw Runcheng collapse after being shot, and she shot Steve Lee in desperation. . . Other guards arrived, and Zhenbiao finally took all the blame himself and was shot dead in the president's office. After a period of time, uncle and Runcheng's mother discussed things after going to the United States. Runcheng was shot but didn't die. Nana looked for Runcheng with her luggage. When she looked back, she found Runcheng standing behind her. They smiled at each other brilliantly and finally put down all her scruples. . .