Dong Baek's psychometric ability helps capture suspects and his fans send some gifts and letters to thank him. Meanwhile, profiler Sunmi figures out the motive of a serial killer.

Dong Baek notices that a serial killer, Crimson Pig, is related to a chief of an entertainment company. Sunmi figures out that Crimson Pig always kills someone on Monday, and asks the chief about the people who met Kim Seokyung.

Han Sunmi orders to investigate the whole On-ha town, but cannot find the suspect. Whereas, Dong Back and Sunmi finally notice that Crimson Pig's location is On-sang town and not On-ha.

Dong Baek finally notices that a true figure of Crimson Pig is a leader of pseudo-religion. Sunmi is mad at Dong Baek's action that since Crimson Pig's social status is high, Dong Back should let him do mistakes.

The leader of pseudo-religion is murdered during their own ceremony with hammer. Since nobody at the ceremony saw the murder scene, Sunmi suspects that it is committed by another super power owner.

The plastered bodies remind Seon-mi of her father being murdered, when she was young.