Another challenge takes into place in Memorist when cult leader Park Di Gan is murdered in the middle of his ritual. No one was able to see how it transpired, since the worshipers closed their eyes. Dong Baek's team and Han Su Mi's detectives worked on the site to gather more evidence. Dong Baek discovered that the memories of the worshipers were erased. He searched the other room and discovered a painting of Angel Michael defeating the demon as he raised the sword.
At the headquarters, deputy chief Shin Woong called everyone for an urgent meeting. He demanded all detectives solve the case of cult leader Park Di Gan, since he is the center of attention. He asked superintendent Han Su Mi if it's possible to erase someone's memory as what the reports said. He wanted to know more updates as to what Dong Baek claimed.
Deputy Chief Shin Woong dismissed the meeting and asked Han Su Mi to stay. He handed Dong Baek's personal records to her. He instructed Han Su Mi's team to monitor Dong Baek's activities. Han Su Mi accepted the chief's instruction. As soon as she reached her research team they studied and dug more records of Dong Baek's profile.
In the crime site of the cult house, Dong Baek discovered that prior to the ritual, Park Di Gan received the painting. It was delivered to him. They further asked a young girl as she claimed she saw the delivery van. Dong Baek requested the girl to touch her and scan her memories. The girl agreed in exchange for selfie pictures from him. He was able to get the plate number of the van who delivered the painting.
Upon interrogation, the driver told them the house of the customer or sender of the painting. Dong Baek's team went to the place and recovered a female dead body. Few more paintings inside the house. The dead lady is the artist. She died of dehydration, and a bottle of methanol alcohol one of the causes of her death. Her feet were tied with a metal claw and she was forced to draw. On top of the artist's desk, numbers 16669-19 written in the newspaper. A few minutes later, Han Su Mi arrived in the area. They followed Dong Baek's car the whole time.
Dong Baek confirmed with Han Su Mi, he suspects a serial killer has the power to do such a crime. Han Su Mi instructed her team to research the profile of the dead body. Dong Baek offered to help her but Han Su Mi declined. She instructed her team to go home and she will see them all tomorrow. She felt tired and exhausted from the day's activity. Everyone left the place. Dong Baek and his team analyzed the numbers written on the paper.
The number 16669-19 is the newspaper release control number. On that issue, they found an article about a young girl who lost her family. The connection between the doctor and the artist gave more proof of the serial killer.
As she reached her house, Han Su Mi continued to work on the case. She analyzed the pictures she took from the crime scene. A conclusion from her mind led her to run and proceed to the crime site again.
Inside the artist's house, Han Su Mi moved one art piece that stands behind the wall. She found another entrance to the next room. The place was dark and she recovered 2 corpse covered with hard cement. Shaken and shocked, Han Su Mi said a prayer.
