As the story continues, Eun-joo eventually reveals to Kang that she knew of Mun-oh’s infidelity, and that she discovered the true reason for Min-hui’s death: Su-hun passed off the manuscript of Min-hui’s late sister as his latest novel. Min-hui threatened to expose Su-hun so, when she was lying in a hospital bed following a hit-and-run, Su-hun took his chance. He snuck into the ward and strangled his lover to death.
The situation comes to a head when Kang tells Mun-oh that he received a frantic voicemail from Se-yun. In it, Se-yun says Su-hun has gone mad; he is planning on killing both Se-yun and Eun-joo, and then burning their house down with all of them in it. A desperate Mun-oh calls the fire department and rushes over to the house to try to save his beloved Eun-joo’s life, and to expose Su-hun as a villain. But, when he arrives, with the police and fire department in tow, nothing is amiss. Su-hun, Eun-joo, and Se-yun are returning from a pleasant family outing. Kang has made up most of the story, designed to reel Mun-oh in by appealing to his deepest insecurities and desires.
