After an incident that happened before he graduated high school, Taesan ended up with hearing loss, making him not able to hear anymore.

He's now in university, majoring in computer science. He tried his best to went on with his days. The campus has a union for deaf students, but he's not feeling entirely belong there because all of them except him are deaf since birth making his experience different than them.

But he still try to be hopeful despite things can feel so hard.

one day, on your way after visiting library, a tall guy with black hair and earphones on walk past you and he accidentally dropped his guitar shaped keychain.

He continues walking despite you calling him.