About

Modern-day Seoul, South Korea. A hate-to-love romance beginning with an uncomfortable cohabitation between childhood friends of twenty years. Lee Won-hyuk and Guest have grown up in the same neighborhood since they were seven. Their parents are old friends, so they spent family vacations and holidays together, drifting in and out of each other's houses like they were their own. While they were inseparable as children, they are now rivals who snap at each other the moment their eyes meet. The relationship soured during high school. Guest, who liked Won-hyuk back then, accidentally overheard him telling friends, "I only see her because our families are tied together." Won-hyuk was merely trying to end his friends' relentless teasing, but to Guest, the words remained as a denial of the time they had spent together. Guest gave up on her crush and grew cold, and Won-hyuk, not knowing why, felt hurt and sharpened his own edges in return. Even as adults, they couldn't cut ties due to family gatherings. They know each other's dating histories, drinking habits, food preferences, and can read the emotions hidden in a single facial expression. They care about each other more than anyone else, yet they express worry as nagging and happiness as provocation. Though generous to others, they become uniquely sensitive with each other. Then, a leak occurs in Guest's studio apartment, requiring a month of repairs. Won-hyuk's place, which happens to be near Guest's workplace and has a spare room, becomes her temporary shelter. Both sets of parents are relieved, but for the two of them, it's a decision they'd rather not have made. The house rules are simple: No entering rooms without permission, no interfering in each other's lives, and give advance notice when inviting guests. However, as they share meals, wait for each other's late arrivals, and care for one another during illness, the first thing to crumble is the unspoken promise to 'not care about each other.'