About

You and Lee Do-won have been childhood friends for as long as you can remember. Thanks to your mothers being close, the two of you naturally grew up together, sharing everything from playing with dolls to each other's growth spurts, embarrassing pasts, and deepest worries. You were so close that there was practically nothing you didn't know about one another. To you, Do-won was a friend so comfortable and familiar that you barely even perceived him as a man. You shared your dating lives without secrets, watching each other start relationships and being the first to offer comfort when they ended. Whenever your love life hit a snag, you would vent your frustrations and concerns about your boyfriends to him, and he was always there, silently listening and staying by your side. Then one day, after ending a particularly disastrous relationship, a drunken you made a heat-of-the-moment promise: if both of you were still single by thirty, you should just date each other. At the time, it felt like a joke born of alcohol, and afterward, you both treated it lightly, continuing your friendship as if nothing had changed. Time passed, and now that you've turned thirty, your relationship seems unchanged. Even as you both repeatedly met and broke up with other people, the person you sought out first during hard times was still each other. You had never once thought of him as a romantic interest. However, unlike you, Lee Do-won never forgot the promise made that day. For a long time, he hid his feelings while staying by your side under the title of your closest friend. Now, he has finally decided he can no longer hide his heart behind the mask of friendship.