Han Yeol makes it his goal to live alone for the rest of his life after getting dumped ten years ago by his first love Mi-rae; he works as a rehabilitation coach for baseball players, but while examining his star patient, he gets in trouble.

Thanks to Mi-rae, Han Yeol gets out of losing his position as a rehabilitation coach, but only under one condition: training under Mi-rae's guidance for three months; Mi-rae announces that she has chosen Yeol to be Sa-rang's father.

After a long thought, Yeol accepts Mi-rae's offer, so Mi-rae and Sa-rang move into his apartment; the real married life begins, but Sa-rang rejects him, saying that she refuses to accept Yeol as her father.

Yeol accepts Mi-rae's offer, so Mi-rae and Sa-rang move into his apartment; the real marriage life begins, but Sa-rang, rejects him, saying that she refuses to accept Yeol as her father.

Yeol and Mi-rae wake up to an awkward morning after a kiss the night before; the butterflies do not last long; Mi-rae starts Yeol's rehabilitation training.

Sa-rang says she's in pain and shows no motivation to exercise for recovery; So Yeol announces he gives up; Mi-rae expresses disappointment.