Stairway to Heaven

As Professor Han, Jeong Seo's father marries Actress Tae Mi Ra, she starts to live with Yu Ri and Tae Hwa, her new siblings. Yu Ri and her mother harass Jeong Seo in every way out of jealousy. Jeong Seo waits for the day to go abroad to go to school with Song Ju who's the one she's in love with and relies on.

Yu Ri and Mi Ra stop Jeong Seo going abroad for studies and even lock her in the attic on the day Song Ju leaves to study abroad. Yu Ri intercepts the letters Song Ju sent to Jeong Seo. Pil Su visits Tae Hwa with a pair of sneakers on Tae Hwa's birthday and runs into Mi Ra. Jeong Seo makes a seaweed soup and a gift for Tae Hwa's birthday.

Jeong Seo goes to meet Song Ju who returns to Korea. Yu Ri hits Jeong Seo with her dad's car under influence. Yu Ri goes to her biological father for help and puts Jeong Seo's ID card into a dead body's cloth, and Jeong Seo is officially reported to be dead.

After returning to Korea, Song Ju becomes the president of one of the affiliates of the Global Corporation. Song Ju and Yu Ri plan to announce their engagement at the company's foundation ceremony. Song Ju runs into Jeong Seo at Global Land and asks her if she's Han Jeong Seo.

As Song Ju doesn't show up in the ceremony where he was supposed to announce his engagement with Yu Ri, Yu Ri tries to drown herself in a river after leaving a memo to Song Ju. Jeong Seo doesn't remember anything about her past life and believes she's Kim Ji Su, and Song Ju keeps showing up in front of her.

Jeong Seo finds out that Song Ju is the president of the company she gets to work for. Song Ju takes Jeong Seo to the house she lived in the past, and Jeong Seo meets her real father there. Tae Hwa sees Jeong Seo getting off Song Ju's car and get anxious.

Song Ju persuades Jeong Seo to meet her original family and see if the family recognizes her, and Cheol Su tries his best to stop her. Jeong Seo introduces her newly-designed cloth for the upcoming season, but Song Ju tells her to come up with a better one. Both Yu Ri and Tae Hwa become anxious that Jeong Seo might regain her memory.

Jeong Seo gives a presentation on the new product she came up with and gets a good evaluation. Song Ju holds a company dinner with the brand development team at a club suddenly. Jeong Seo almost gets hit by a car Yu Ri drives on her way to see Tae Hwa and remembers the accident she got into in the past.

Jeong Seo who regains her memory tries to talk to Song Ju, but Yu Ri takes him away from Jeong Seo. Tae Hwa decides to confess everything to Jeong Seo, but Jeong Seo goes to tell Mi Ra and Yu Ri that she remembers everything. Chairperson Min tells Jeong Seo to quit her job right away.

Jeong Seo goes back home and finds Tae Hwa who passed out. She leaves and goes to the inn she's staying, and Song Ju visits her. They go out and drink together, and Jeong Seo tells him that she's not Ji Su but Jeong Seo, but Song Ju doesn't listen to her. Jeong Seo decides to leave far away with Tae Hwa.