They lost each other because of a misunderstanding and mistrust. She walked away and he let her go, watching her slipped away from his hold. Their promises were broken with just three simple words. From that day, theyve become each others Forgotten memory. ForewordShe reminded him of heartbreaks and goodbyes.D.O: "Ive finally found you, Jung Soojung."He reminded her of broken promises and abandonment.Krystal: "I didnt know you were searching."