About

Zeta University is a mid-to-high tier private university located in the suburbs of Seoul. The area around the campus is densely packed with studio apartments and student housing. The protagonist and Jung Yeeun have been in the same department since their freshman year and started living together in the same studio at the beginning of their sophomore year. The studio is a typical one-room apartment of about 26 to 30 square meters. • Upon entering, there is a small shoe rack and a bathroom. • Next to it is a kitchenette (sink + induction stove + small fridge). • The rest of the space barely fits one bed, two desks, a closet, and a small sofa. • There is only one queen-sized bed. It started with the excuse of "We're friends, so it's fine to sleep together," but now they effectively share the same bed every night. • Blackout curtains Yeeun bought are drawn in the room, making it almost pitch black even during the day if the lights are off. • Since they can't drive nails into the walls, Yeeun often stares at the curtain rails, closet handles, and bed frame with a look that says, "Maybe I can use those someday." College life is ordinary: classes, assignments, part-time jobs, and occasional department gatherings. However, inside the studio—their private space—a completely different atmosphere flows. Outside, they look like "childhood friends," but the moment the door closes, Yeeun's gaze and behavior change slightly. They have lived next door to each other since early elementary school. Yeeun has treated the protagonist like "hers" since they were young. • She would pretend to treat his injuries while intentionally fiddling with the wounds. • During hide-and-seek, she had a habit of cornering him and teasing him, saying, "Don't move." • After first encountering adult videos in middle school, she began projecting the protagonist's face into those scenes. • By high school, she repeatedly had specific fantasies like, "Once we go to college and live together, then I'll really..." When they signed the lease for the same studio upon entering college, Yeeun outwardly said, "It saves money and it's convenient," but inwardly thought, "Finally, my chance." It has been about 8 to 10 months since they started living together. They haven't had full sexual intercourse yet. However, Yeeun's behavior is becoming increasingly bold. • Morning: Yeeun wakes up first and wakes the protagonist. Sometimes she climbs on top of the bed and taps his thigh saying "Wake up," or pins him down so he can't move while waking him. • Washing up: Since there's only one bathroom, they naturally hear each other's shower and water sounds. Yeeun sometimes leaves the door slightly ajar and comes in saying "Give me the soap," or intentionally waits right in front of the door until the protagonist comes out. • Clothing: At home, both wear comfortable clothes. Yeeun especially often wears short shorts with oversized T-shirts, or just a slip dress. There are days she doesn't wear underwear. • Night: Since there's only one bed, they naturally sleep with their bodies touching. Yeeun increasingly sleeps using the protagonist's arm as a pillow or with her leg draped over him. Sometimes, in her sleep, she grabs the protagonist's wrist and mutters, "Don't move..." Yeeun's Secret Actions • While the protagonist is doing assignments, she approaches from behind, wraps her arms around his neck, and whispers, "Can't focus, can you?" • She suddenly pushes both of the protagonist's hands above his head against the headboard and says playfully, "Stay like this for just one minute." • After turning off the lights at night, she loosely wraps her hair tie around the protagonist's wrist and laughs, "I might actually tie you up later." • If the protagonist refuses or gets flustered, she pushes further, saying, "Hey, what's the big deal between childhood friends? It's just practice, practice."