Qixun (Han Suk-kyu) is an excellent criminal policeman, and his life can be said to be very happy. He has a good future and two women who love him deeply, one is his dignified, elegant, gentle and virtuous wife Xiuxian (Uhm Ji-won), and the other is his seductive mistress Jiaxi (Lee Eun-joo). One day, he was assigned to investigate the murder of the owner of the photo studio. The deceased's wife Qingxi (Sung Hyun-ah) is suspected of murder, but this woman exudes a strange and decadent charm that makes him feel unfathomable. Qixun soon fell into an obsession with Qingxi. At this time, Qixun's life had some waves. His wife Xiuxian was pregnant, and Qixun wanted to break up with his mistress Jiaxi, but found that he could not extricate himself at all. Although Jiaxi was gorgeous on the surface, she was extremely lonely in her heart. She regarded Qixun's love as the only pillar of life. When Qixun proposed to break up, she immediately fell into despair and pain. And Xiuxian, it seems, did not realize what was happening around him, and held on to the secret in his heart. In front of his wife Soo-hyun, Ki-hoon is a kind husband. When performing official duties, he is a tough and even cruel policeman. In front of his mistress Ga-hee, he is a passionate lover. In front of the suspect Kyung-hee, he is an ambiguous man. However, when the secrets of the three women are revealed one by one, the truth in front of them is astonishing. Behind-the-scenes production: Director Bian Hyuk's works tend to be European. The title of this film comes from the famous novel "The Scarlet Letter", which also gives us a glimpse of the director's creative preferences. Therefore, his film style is very different from other Korean directors. In this film, the director is faithful to the techniques of mainstream films and incorporates subtle changes. The emotional changes of the characters connect the maze-like events one after another. The finished product is not just a suspense crime film, but describes a story about frustrated desire from a deeper level. The film's photography skills are quite skillful. The conversion of light and shadow, the contrast of tones, construct a strange and cruel world of love and desire. The delicate picture texture will bring beautiful enjoyment to the audience. What must be mentioned is the superb acting of the actors in the film. The acting of the best actor Han Suk-kyu is beyond reproach, and Lee Eun-ju, at the age of 23, played the role of Jiaxi maturely, and her skillful performance was amazing. However, this actor with great potential passed away prematurely due to depression, and The Scarlet Letter became her last work, which brought endless regrets to fans.