Yun Seo accepts Ju Won's mother's offer to break up with him, unaware he's part of the wealthy AL Group family. She tries making him resent her gradually, but drunkenly calls to end things abruptly.
Ju Won, the director of AL CARD and Yun Seo's superior, pursues her relentlessly after getting an office next to hers. He flirts shamelessly, vowing never to let her go, while Yun Seo reluctantly agrees to have meals with him 27 times.
Joo-won responds to Yoon-seo's feelings of confessing her feelings while being swept up in the atmosphere, and makes a public confession. The next day, when the two meet at work, they are left with dizzying memories.
The two people who have to keep meeting each other at work even after a complete breakup have a hard time. But a few days later, Yoon-seo starts receiving mysterious 'text messages from unknown senders'.
Ju Won leaves his family, appears at Yoon Seo's place, revealing their relationship to colleagues. Their breakup was due to his family's opposition, causing tensions at work. A crisis hits the Hanok Stay exhibition opening.
Yun Seo and Ju Won struggle with lingering feelings after their breakup. Seong Min's unexpected arrival sparks Ju Won's jealousy, adding to Yun Seo's emotional turmoil as she navigates her complicated relationships.
Yoon Seo and Sung Min grow closer, making Ju Won jealous. Following Si Won's advice, Ju Won becomes more aggressive, confusing and angering Yoon Seo. However, she is surprised by her reaction when she sees Ju Won with another woman.
Ju Won attends Yun Seo's mother's funeral, comforting her. He proposes marriage, leaving her speechless. Before she can answer, he's forced to leave for Spain. Yun Seo rushes to the airport, fearing she'll lose him forever.
Yun Seo realizes she must address an issue before being open about her relationship with Ju Won. Handling it alone, the outcome may be unfavorable. Meanwhile, Si Won and Mi Jin's honest night takes an awkward turn.
Wealthy heir Ju Won is to wed Yun Seo to fix his family's scandal. However, his mother intends to humiliate Yun Seo by exposing her humble roots, leading to a confrontation that Yun Seo tries to defuse.
