Shi Mok and Yeo Jin discover perplexing leads while searching Kyung Wan's basement. Dong Jae goes back to Chang Jun's office to fetch his cell phone.

Returning home from the rooftop party, Shi Mok discovers that an intruder has left something in his bedroom. Yeo Jin and Gun come over right away.

Yeo Jin suspects a new killer is involved in the latest murder incident. Meanwhile, Shi Mok collapses after leaving the autopsy.