Sungyeol doesn't expect to meet his soulmate in the library during his junior year, the last place he would ever think for them to meet, while Myungsoo is visibly shaken by the tall, beautiful boy in front of him.
Sungjae is always used by his bestfriend, Lee Sara, who has been his friend for years. One day he goes to pick her up when he runs into a nerd looking girl with blocky glasses and she reminds him of her but her face is much more innocent and sad. Before eh can introduce himself the girl runs off. To his suprise she goes to his school and has the same last name as Sara which isn't very common with the last name Lee. the
Lee Jaemi, a criminal living in London, has to go back to South Korea in order to avoid jail. What happens when her cousin makes a deal with his boss and Jaemi is forced to live with a bunch of boys in a dorm and has to share a room with one guy she hates? But ...
As he reminisces about those old days with her, he thinks about how his life is with her now.