Kitty Song Covey is in a long-distance relationship with her boyfriend Dae, who lives in South Korea. She is offered a full scholarship at the Korean Independent School of Seoul (KISS), where Dae is a high school student and her mom studied as well. Wanting to see Dae and feel a connection to her mom, she convinces her dad to let her go. At the Seoul airport, she misses the bus to take her to the school and attempts to navigate on her own through public transit. Kitty is accidentally hit on the street by a car carrying Yuri, a popular student at KISS whose mom is the principal. 

Yuri offers her a ride to school, and Kitty later discovers the chauffeur is Dae's father. Yuri is in a secret relationship with a girl called Juliana and in order to hide it from her mom, she has Dae pose as her boyfriend in exchange for paying for his tuition for the semester. Kitty arrives at the school's welcome party and is thrilled to see Dae, but she leaves heartbroken when Yuri tells her Dae is her boyfriend.

It's the first day of school at KISS, and Kitty has been nicknamed the "Portland Stalker." Dae wants to tell Kitty the truth about his relationship with Yuri, but he is forced to sign an NDA and keep it a secret. Yuri tells him that she doesn't mind if Kitty knows the relationship is fake,

 as long as the reason for the relationship is not shared. A teacher tells Yuri's mom, the principal, that he suspects Dae wrote one of Yuri's assignments for her. Yuri's mom takes away Yuri's credit card, wrecking her plans for taking a trip with Juliana, who disappeared after she and Yuri were seen embracing by Juliana's housekeeper. Kitty discovers Q has a crush on a boy named Florian and helps them to become lab partners in chemistry class.

Kitty tells Dae the other person she has feelings for is Yuri, hurting him and causing him to leave. Jina tells Lee that Alex is his son and that she didn't tell him so he wouldn't give up his dream for him. The final exam results are posted, and Kitty has passed all her classes, but she is expelled when she is found out to have been living in the boys dorm. Kitty gives Jina music that she downloaded believing it was for her mom, and Jina gives her a letter that Eve wrote to her but she never responded to

. Florian is ranked first in the exam results due to his cheating, jeopardizing Dae's scholarship, which requires him to be ranked first, putting Q in a hard position. Kitty breaks up with Dae, telling him he was the first boy she ever loved, and he tells he loved her too. Yuri is at the airport waiting for Juliana, and Kitty is about to tell her how she feels, when Juliana appears, so Kitty leaves quietly. Yuri calls her mother and tells her it is a mistake to expel Kitty. Kitty reads her mom's letter on the plane and finds out her mother's first love was someone called Simon. Min Ho is seated next to her, traveling to see his mom in Los Angeles, and he confesses his feelings to Kitty, leaving her dumbfounded.


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