Second 20s

No-ra is a stay-at-home mom on the verge of getting divorced because of the gap between her and her professor husband; to try to stop the divorce, and so she isn't an embarrassment to her son, No-ra begins studying for the college entrance exam.

No-ra is accepted to college without her son and husband knowing; she meets her alumni Hyun-suk in her first class, who became a popular professor; No-ra is in shock when he embarrasses her by telling her to get out of his class.

No-ra mumbles when Hyun-suk corners her, asking why she is attending university behind her husband's back; No-ra gets annoyed by Hyun-suk, who has changed so much from his bright, bubbly personality.

No-ra feels as if she's alive again and enjoys the moment; Hyun-suk, who misunderstands that No-ra does not have many days to live, feels mixed emotions towards her when she is sexually harassed and excluded by people.

No-ra gets an opportunity to work at Hyun-suk's office; Hyun-suk, who thinks that No-ra does not have much time left, tries to help her so she can check off her bucket list and live happily.

No-ra witnesses her husband cheating on her; No-ra spends her days in sorrow from the shock, and Hyun-suk feels uneasy watching her; Hyun-suk prepares an April fool's surprise event to cheer No-ra up.