"Prosecutor" Azhi and "lawyer" Ayuan have been dating since their student days and have been dating for a total of 7 years. After the two broke up, they would introduce each other's new lovers to each other, and would meet and complain about each other whenever something happened... This delicate relationship lasted for 13 years. One day, a death occurred in the "Future Port Serial Crash Case" that Azhi was in charge of, and the case suddenly became very serious. And Ayuan, who had originally decided not to deal with criminal cases, also became the defense lawyer for the suspect in this case... The two who were once lovers are about to confront each other as prosecutors and lawyers. Prosecutor Azhi needs to file a case against the suspect, and lawyer Ayuan wants the suspect to be released. The two stood on their respective positions and began to investigate the truth of the case. At the same time, Azhi, Ayuan and their current lovers, these four people have an extraordinary and complicated relationship, and the story unfolds in an unexpected direction...! (Introduction translation: Puff@日菁字幕组)