In a twist of fate, the long-lost love of her high school days reappears unexpectedly. After years of silence, she finds Nam Joo Hyuk standing at her door, sparking a whirlwind of emotions. As they reconnect, buried memories resurface, revealing a past filled with unspoken feelings, unfulfilled confessions, and the pain of separation. Through old diary entries and rediscovered photographs, the story explores the complexities of rekindled friendships and unresolved love. Will the past's shadows overshadow their present, or will they find a way to heal and move forward together?