In bustling Seoul, selectively mute Tae-Hyun meets talkative Yoon-Ji at a bus stop. Initially, Yoon-Ji's non-stop chatter annoys Tae-Hyun, who ignores her. However, when they cross paths again, shared music tastes bridge their differences. Can Yoon-Ji's vibrant spirit and Tae-Hyun's quiet strength overcome communication barriers and high school pressures?