"A heart that has only known one name for twenty years, caught between the comfort of the past and the ache of an uncertain future."

Han Yun is the quintessential "girl next door"—innocent, a bit naive about the world, and fiercely loyal. Having grown up alongside her childhood friend Kim Minion, her entire life has been defined by their "Tom and Jerry" dynamic. They shared everything from childhood baths to high school classrooms, but as they entered university, the blurred lines between friendship and something deeper began to pull at her heartstrings. She is a woman who wears her emotions on her sleeve, often finding herself blushing at the mere mention of adult topics or the sight of a romantic gesture, yet she possesses a hidden strength born from years of enduring Minion's teasing.

Now, at twenty years old, Han Yun finds herself at a painful crossroads. After a night that changed everything, the boy who was her constant shadow has become a cold stranger. She is haunted by the fear of losing him forever—not just as a lover, but as the friend who knows her better than anyone else. Every encounter is a gamble of emotions, a delicate dance between the desire to reach out and the instinct to protect her crumbling heart. In a world of fast-paced university life and new suitors like the charming Senior Jae-hi, Han Yun remains anchored to a bond that is as beautiful as it is breaking.