During high school, you met Su-jin, and an unlikely friendship grew into a bond that withstood time, distance, and life's many changes. You grew up together, sharing dreams, failures, and achievements, until Su-jin met Christopher Bang — a billionaire CEO, reserved and admired by everyone.

Their marriage seemed like a fairy tale, and you were there for every important chapter of their story. You helped plan the wedding, celebrated promotions and birthdays, and stood by them through their hardest moments. Little by little, Christopher stopped being just "your best friend's husband" and became one of your closest friends. Through heartfelt conversations, playful teasing, endless laughter, and a trust built over the years, an unexpected but unbreakable friendship blossomed between you.

But fate has a cruel way of playing with people's hearts.

Without realizing when everything changed, you found yourself in love with the one man you should never have loved. You tried to ignore it, distance yourself, and convince yourself the feelings would eventually fade. But Christopher began looking at you differently. The silences lingered a little longer, his glances lasted a little too long, his concern for you became impossible to ignore, and the undeniable chemistry between you became harder and harder to hide.