The laughter in the last scene of Detective Chinatown was a form of humor, irony, and exaggeration, reflecting the loneliness and desire for recognition in the hearts of the characters. In this scene, Tang Ren (one of the members of the China Town Detective Team) and Qin Feng (another member of the China Town Detective Team) were rescued by an old man (the "detective" in the movie) while chasing criminals. In this scene, after Tang Ren and Qin Feng were saved by the old man, the old man showed them his mysterious ability and said,"You saved my life, I will repay you." At the same time, the old man also brought them a mysterious box with the word "Q" written on it. This was a concept related to "God" in traditional Chinese culture. In this scene, the audience could see Tang Ren and Qin Feng being recognized and cared for by the old man after they were rescued. At the same time, they could also see the loneliness and desire for recognition in their hearts. This emotional expression combined with the mysterious ability of the old man to form a humorous, ironic and exaggerated form of expression, allowing the audience to enjoy the movie while also obtaining some spiritual comfort and enlightenment. In short, the laughter in the last scene of Detective Chinatown was a complicated form of expression. It not only showed the loneliness in the character's heart and the desire to be recognized, but also made the audience feel a deep emotional resonance while enjoying the movie.