In the opening scene of Episode 2 of XO Kitty Season 3, Kitty ventures to New York to spend the summer with Lara Jean. Through her Instagram posts, Kitty attempts to paint a picture of an enjoyable experience for Min Ho. The sisters engage in a heartfelt conversation about Lara Jean's relationship with Peter, with Kitty harboring a hopeful belief that they will find their way back together. Lara Jean, in turn, expresses her pride in the person Kitty has become.
The episode shifts to Seoul, where Kitty returns to school for her senior year. Inspired by Lara Jean's guidance, she creates a "sunset list" of all the things she desires to accomplish. She shares this list with her cousin Jiwon, who admits to feeling nervous about her first day as a teacher at KISS. Meanwhile, Professor Lee approaches Kitty about her poor grades and advises her to enroll in an additional elective course, emphasizing that it will significantly impact her final grades.
As Kitty runs into Min Ho, they begin reminiscing about their summer. However, their conversation is interrupted when Min Ho's old friend and former roommate, Marius, arrives. Marius displays a cold demeanor towards Kitty and reveals that he used to be their fourth roommate before leaving the previous year. Min Ho escorts Marius to the dormitory, where they discuss Kitty. Dae is thrilled to see Marius, but Q appears tense and uncomfortable.
Later, Kitty shares her plan to watch the sunrise together with the group. Marius dismisses the idea and suggests hosting a party instead, which excites the others but disappoints Kitty. Marius also reacts with surprise when he learns that Q is dating Jin. In private, Q confides in Kitty about his past with Marius, and she urges him to set boundaries out of respect for Jin.
Elsewhere, Kitty meets Yuri, who reveals that she may have to drop out due to financial constraints. Kitty suggests selling Yuri's designer clothes at Marius' party to raise money. Yuri hesitates but eventually agrees to host a pop-up shop.
Meanwhile, Q asks Marius to move rooms, but he refuses and mocks him. That evening, Min Ho helps Kitty carry the clothes to the party. Kitty informs Juliana and Praveena that Yuri will be moving into their dormitory, which concerns them both.
In this episode, the characters navigate through a series of emotional and personal challenges while also maintaining their friendships and relationships amidst growing complexities. The episode paints a vivid picture of their interactions and decisions, bringing the story to life for the viewers.
At the party, Madison makes a request to purchase Yuri's shoes, yet Yuri declines due to their emotional significance. She later confides in Dae that the shoes had been her companion during her breakup with Juliana. The pop-up shop proves to be a success, and Yuri accumulates most of her earnings. As there's nothing left to sell, she eventually agrees to Madison's offer for the shoes.
Meanwhile, Marius notices Min Ho abstaining from alcohol to participate in Kitty's sunrise plan and pressures the group to drink. Kitty enquires from Q if he handled the room situation, but he confesses he didn't. Kitty takes matters into her own hands and challenges Marius to a beer pong game. However, her game is interrupted when Jiwon arrives and scolds Kitty for her irresponsible behavior. Kitty pleads with Jiwon not to inform Professor Lee, and Jiwon agrees to clear the party. Kitty informs the guests, and they begin to clean up and leave. Marius blames Kitty for ruining the party.
Later, Min Ho follows Kitty, who confronts him about avoiding a serious conversation. Kitty expresses that everything going wrong in her life is exacerbated by his silence. Min Ho admits that he likes her and didn't hook up with anyone over the summer. Kitty says the same but remains upset. She returns to her room and remembers she still needs to choose an elective. Ultimately, she selects Korean Literature, the last and most challenging option. She goes to sleep and wakes up early to messages from Yuri asking her to come to the rooftop.
On the rooftop, Kitty finds her friends gathered for the sunrise. Yuri informs her that she managed to pay her fees. Kitty expresses pride in Yuri and informs the others that Yuri will be living with them. Dae surprises Yuri by buying her shoes back from Madison.
Meanwhile, Q requests Marius to stay away, but Marius threatens to reveal a secret about "the photo," leaving Q shaken. Kitty thanks Min Ho for arranging the sunrise. He reiterates that he likes her, and they finally define their relationship. They share a kiss on the rooftop as the group celebrates the start of their senior year. The episode ends with Marius calling someone named Gigi to help Min Ho deal with his situation.
