The casting of the various characters in the drama was perfect. The casting director/team has done a commendable job.

The drama was really good and did well until episode 24.In this episode Jiang Yue Lou learns about Chen Yu Zhi's death after being shot by him.He apparently is feeling guilty and is appearing to be sad while drinking .In the resulting scenes talking aloud by himself he says that he wouldn't let Yu Zhi die in vain and that after everything was over he would go find him to 'apologize'. Is he serious. This is actually quite selfish and inhuman of him. So he will make undercover plans with his superior and use an innocent civilian to prove himself for it and when the person dies he thinks he can get away with it by just an apology. That was blatant misuse of his position.So if Yu Zhi had really died Jiang planned to just say a sorry at his grave and carry on normally with his life and his promoted position in his job happily ? He would have enjoyed a marriage with Chu Ran and lived like an innocent and upright officer. What a selfish and conceited person .He should have thought to turn himself in after the completion of the mission and to accept legal punishment by law. He was shown as a righteous cop until then.But this ruined everything. Did he really think that he should have gotten away with what he had done.
At the end actually it was he who deserved to die and not Chen Yu Zhi. But alas the good ones die early and wicked and evil people like Jiang Yue Lou outlive everyone.