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Kang Gon, a prosecutor who can't stand injustice, is enjoying his last day at his office in Cheonghae. On his walk, he comes across a man with incredible power and an unusual bracelet. The two get into a fight, but in the process, the man is killed. Meanwhile, So Young and her team are conducting a police investigation to find Chairman Nam Chul Soon who has been missing for a week.

So Young continues trying to find Nam Chul Soon without her senior detectives' help. Following traces and Nam Chul Soon's behavior patterns, she ends up in Nam Chul Soon's vacation house and finds something. Meanwhile, Se Hwang tries to come up with a scheme to bring back the item he has lost.

On the day Gon and Da In move into the new place, they first meet So Young. But Gon thinks he has met her before. And on the day Gon returns to the prosecutors' office, he receives a phone call from Se Hwang. In the meantime, a prosecutor is murdered, and So Young finds something at the crime scene.

After being told that Da In is home alone, Gon leaves his office to see Da In. Also, Gon meets with a witness who claims that he saw a light at the crime scene when the chief prosecutor was murdered. Thinking that some supernatural power could have caused the murder, Gon starts to look for Ko Dae Soo.

After inspecting evidence for the second murder case, there are too many unexplainable oddities. To find out more, Gon heads over to see So Young, the first witness of Kim Jae Jun. Meanwhile, Da In discovers that the bracelet she found has special powers.

Gon witnesses Dae Soo being attacked by Dong Young. Gon tries to stop Dong Young, but Dong Young is too strong to fight against. In the end, Dae Soo goes into a vegetative state. Meanwhile, Se Hwang continues trying to take the bracelet away from Da In. When Da In is home alone, one of Se Hwang's men tries to break into the house.

So Young finds out that the tattoo on Da In and Dae Soo's wrist are the same as the stamp pattern of an old amusement park. She believes that this case has something to do with the amusement park and its related case that Gu Cheol was in charge 16 years ago. When Gu Cheol in informed of what So Young has found, he seems to be shocked and somewhat anxious.

Gon is informed of a murder that is about to take place from a nameless source. When he arrives at the scene, he sees a man dying. So Young joins Gon to find evidence, and they realize that there's another person in hiding at the scene. Meanwhile, Se Hwang asks Yu Ra to carry out a mission for him.