Seo Jeong-goo

Ja-yoon is a high school student who struggles with memory loss after she endured some unknown trauma during her childhood. While trying to uncover the truth, she is unwittingly dragged into a world of crime and finds herself on a journey that will awaken many secrets hidden deep within.

So-Eun is a safe breaker planner. She plans a heist with expert safe breaker Jang-Choon and thief-actor Cheol-Soo. They dream of changing their lives with this job. Meanwhile, Gyu-Cheol is former elite prosecutor, but he lost his memory in a mysterious accident. Nowadays he does foolish acts.