In the interrogation room of the police station, a man named "xu taiyang" shows up. He's 27 years old, and he's just confessed to murdering a man. The police officer, wanchangchun, is in his 50s, and his eyes are "full of sorrow" . The man tells the police officer that he just committed a murder. Aww, that's a long time ago. What's the matter with the murder? Well, it's been 27 years since the murder, and the police have still not solved the case. What do you want from me? What did you promise