The nails of the cadavers were being polished by someone. The body was over an year old and the victim had had an infection of SARs. Shi Cheng had seen the culprit, but was unable to catch him. He suspects that he had jumped off a low rise window. Li Jia dismantles the theory, but the prime suspect becomes the security guard who had run back up the stairs to Shi Cheng during the chase. He had previously worked in a mortuary. Both of them catch him in the act and report it to the officials at school. Li Jia asks Shi Cheng about his past after noticing that he had claustrophobia. He thanks Jia and they head out for dinner together. Vincent Chan approaches Jia again. He tells him that it'd be good if he got involved with other cases as it would help him understand himself better.