The Story of Park's Marriage Contract

Yeon Woo, a noble family member in Joseon, secretly makes clothes and sells them to the market, which is against the code of conduct for noble women in conservative society. One day, she gets in danger of being caught and punished for her clothes being considered too bold and vulgar. Soon, she is almost forced to marry into another noble family without knowing or seeing her future husband. After the wedding ceremony, her husband shares one big secret. 

Yeon Woo ends up in Seoul in the present time. She nearly drowns in a swimming pool, but she gets rescued by Tae Ha, who is the grandson of Chairman Kang of SH Group in 2023. Without understanding the current situation, Yeon Woo ends up becoming Tae Ha's bride. Chairman Kang's surgery gets delayed, so Tae Ha has to pretend to be married until Chairman Kang leaves for the US. Tae Ha suggests Yeon Woo to draw up a contract regarding their fake marriage.

Yeon Woo believes that she has found a way to go back to Joseon and heads to the pool where she first met Tae Ha in the 21st century. She soon gets caught by Tae Ha and happens to see a piece of painting from Joseon. With her knowledge of the old painting, she helps Tae Ha not to fall for Hye Suk's scheme which could damage Tae Ha's career.

Tae Min announces to the whole family that he'll start working at the company, fighting against Tae Ha to be a successor. He also warns his mother that he hasn't decided which side to take. Chairman Kang's birthday is held, and Yeon Woo meets Tae Ha's whole family, including his aunt. She also runs into Sa Wol, who got hired as the family's new housekeeper. 

Hye Suk hands over another business proposal to Midam to make them decline Tae Ha's proposal. Furthermore, she uses Yeon Woo to raise the stakes about Tae Ha's marriage. Meanwhile, Yeon Woo wants to meet Chen Myung again to find the way back to Joseon.

Mi Dam decides to hire Yeon Woo as Midam's guest designer after seeing her embroidery work. Through this, Yeon Woo gets to participate in SH Seoul's first-anniversary event, which jars on Hye Suk's nerves. Hye Suk lures Yeon Woo into the annexe of the family house, knowing Tae Ha hasn't gotten over his trauma. Tae Ha runs into the annexe to save Yeon Woo, but his heart starts malfunctioning. 

The company's biggest event of the year, the first-anniversary event, is just around the corner. However, someone leaks Yeon Woo's collection all over the internet and gets Tae Ha into trouble. Chairman Kang tells Tae Ha and Yeon Woo to give up on the project.

Tae Ha and the whole marketing team go on a vacation to Jeju Island. While Tae Ha is away, Hye Suk holds a general meeting to discuss Tae Ha's dismissal due to his illness. Yeon Woo confesses her feelings for him, but Tae Ha tells him that they should end everything. Meanwhile, Sa Wol finds out that the Kang Family killed Yeon Woo.

Yeon Woo is devastated upon uncovering that Tae Ha's family from Joseon directly contributed to her demise. Meanwhile, amidst this turmoil, Hye Suk is determined to diminish Tae Ha's sway, but her efforts may have crossed a precarious line.

Ha Na revealed that she has been watching Tae Ha under Chairman Kang's order. Tae Ha confronts his grandfather and finds out that it was him who killed Tae Ha's mother. Yeon Woo sees Chairman Kang to ask him to apologize to Tae Ha if he truly loves him. Meanwhile, Mr. Hwang reveals his true identity to Chairman Kang.

Yeon Woo is prepared to go back to the Joseon she came from in order to save Tae Ha. In contrast to Yeon Woo, Tae Ha cannot come to terms with the idea of parting with her, regardless of the circumstances. The farewell is just two weeks away, and Tae Ha values every moment that could potentially be the last memory he shares with Yeon Woo. 

Yeon Woo reveals that Lady Yoon tried to throw her into the well and poison her son to death. Yeon Woo gets attacked by Duk Gu who escaped from the jail. But Yeon Woo thinks on her feet and escapes from his captive. Yeon Woo falls off a cliff while escaping, only to return to the new Joseon.