Enming moved into a new rental house, his quiet and normal life was destructed by next door married couple's brawl afterward. By the following days, the brawl between the couple became more and more intense. Enming once suspected a murder might happen, so he asked the residential security to figure out the situation. Then he realized the source of the sound wasn't come from his neighbors, but actually from his own house... Later, Enming accidentally found out that the strange sound was from a 'husband murdered his wife' homicide case 10 years ago. After Enming read the news, his suspicion was heavily increasing, because he clearly know the murderer in fact, was someone else.