When Yoon, Cho Hee was given a full scholarship to Kyung Hee University, her parents had made it very clear to her to devote her time to studies, rather than cute boys and romance. Her friend, Jin Ju, is repulsed by it when she finds out Cho Hee doesn't even know any of Kyung Hee's flower boys, and drags her off to the university's secret romance club "BF T3XT 53RV1C3", a twist on the system of regular penpals. Any eligible bachelor on campus gives the club his number and the number will later be given to a random bachelorette. Both an interesting and mysterious concept, the two anonymous persons will continue to text each other until they like each other enough to meet in person.

Cho Hee, slightly curious though she doesn't want to admit it to her friend, texts him, but not really expecting a text back. At first, he would constantly text her to the point of irritation, but she gradually began to look forward to whenever he sent something to her, especially when he texts her by her name indicating her knows her, yet she doesn't know him. She begs him to say his name, but he won't budge, teasingly insisting she has to find out on her own. Her guesses narrow down to the top five handsome boys on campus: SHINee.