Overview: Seol and Se-joo travel to the past and meet their past selves. After escaping the gunfight that broke out in Gyeongseong, Seol and Se-joo find out that there is a secret agent hiding among Joseon Youth Alliance. Meanwhile, Jo Sang-mi continues her plot against Seol, and Se-joo finds out that Sang-mi’s target is Seol, not him.