Kim Seungmin

University dormitory. Room 307.

Due to a mismatch in the assignment, Seungmin and Sehyun become neighbors.

At first glance, they are completely different.

Seungmin lives by a schedule: wake up at 7:00 AM, perfectly made bed, notes on colors, silence after 10:00 PM. He can't stand disorder, noise, and people who don't respect other people's boundaries.

Saehyun is his complete opposite. He goes to bed late in the morning, constantly listens to music without headphones, leaves things all over the room, and can forget his coffee mug on the windowsill for days. He's friendly, talkative, and completely confused as to why Seungmin always looks like he's ready to throw him out the door.

From the very first day, a real war begins between them. They argue over lights, alarm clocks, open windows, cleaning, and even who should take out the trash. Each is convinced that their neighbor will ruin their entire school year.

But there is no choice - they will have to live under the same roof for the next few months.

Perhaps constant bickering will eventually become a habit. Perhaps habit will turn into trust. Or perhaps room 307 will change both of their lives forever.