The Abyss Episode 4

The police identify Li Guo Kun as Feng Xiao Juan's killer after finding his DNA on a glove recovered from the trash. Li Guo Kun flees, leading Cao Jin, Tao Zi, Lu Fan, and Ning Zhen on a chase. He evades capture by ditching a taxi, stealing a bus ticket, and then getting off the bus mid-route. During the wilderness search, Ning Zhen uses her tracking skills to follow Li Guo Kun's trail, discovering he used pine resin to mask his scent from police dogs. However, they find Li Guo Kun murdered, with the same cryptic symbol from the 15-year-old Ning De Fu case left at the scene. Investigations reveal Li Guo Kun contacted an untraceable number before his death and was taking expired medication. Cao Jin decides to reopen the old case due to the symbol's reappearance and asks Ning Zhen to join the team, revealing to her that Lu Fan is the little girl connected to the original incident. (Source: tvrili.com)