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.

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