An An defines their relationship this way: she is the dust accumulating in his house.
When he doesn't come home, he forgets about it. The moment he sees it, he cares a great deal. If he wants it to move in, he has to clean it up, but somehow he can still live alongside it.
Put plainly, he cares, at most. Maybe it even bothers him.
After she thinks she's swept herself out the door, someone turns years of accumulated dust into sand paintings, molds it into dolls, and cherishes it as a treasure.
He comes after her again to talk about love, just as she slowly learns to let go of every moment she loved him.
Their years of back-and-forth leave them out of sync: he edges closer, while she drifts farther away, day by day.
By the time he finally begins to fall for her in secret, her long season of girlish love has come to an end.
Theme: A Chinese-style CEO and a bittersweet unrequited love.
