Royal Concubine Kang Dan-sim is sentenced to death by poison. But when she wakes, she finds herself in a very different place: modern-day Korea.

As Dan-sim tries to adapt to the new world, her strange ways attract the attention of chaebol heir Cha Se-gye — who approaches her with a proposal.

Dan-sim learns more about Seo-ri's past. As Se-gye and Seo-ri spend more time together, mixed signals push them to put their feelings to the test.

Confused by Seo-ri's mind games, Se-gye pulls out all the stops to win her heart. Later, Seo-ri deals with a pesky co-star and politics on set.

Seo-ri and Se-gye fly out to Jeju, but an emergency leaves Se-gye rattled. Later, Seo-ri goes missing and a worried Se-gye heads out in search of her.

Seo-ri's feelings for Se-gye grow, but she starts having doubts when Mo Tae-hee stakes her claim on Se-gye as well. Suddenly, Se-gye runs into trouble.

Tae-hee announces her engagement to Se-gye to the press, angering Se-gye and fueling Seo-ri's jealousy. Choi Mun-do threatens Seo-ri with a demand.

Se-gye confronts Seo-ri about her identity — who is Dan-sim? Forced to face her past, Seo-ri makes up her mind about her relationship with Se-gye.

With the link between Seo-ri and Dan-sim revealed, Se-gye and Dan-sim make things official. A furious Mun-do goes to extreme lengths to take revenge.

Dan-sim wakes to find herself back in the Joseon era. While she tries to return to the present, Se-gye deals with the fallout from Mun-do's scheming.

Dan-sim and Seo-ri's worlds start to collide. Se-gye takes Dan-sim to meet someone important to him, but she reveals that they're running out of time.

Seo-ri's grandmother's health takes a bad turn. Later, Dan-sim is presented with a difficult ultimatum — that puts her future with Se-gye on the line.

Dan-sim's choice sends her back to the Joseon era, leaving Se-gye heartbroken and alone in the modern world. Will fate allow them to reunite?