During a mock trial at school, a student makes a shocking discovery. Yang Jong Hoon, a former prosecutor-turned-professor, examines the crime scene.

Two best friends, So-yool and Yeon-hee, dream of becoming the top artists in Seoul together. But their friendship doesn't last long as Yoon-woo, So-yool's first love and songwriter, falls in love with Yeon-hee and her voice. So-yool's feeling of jealousy and inferiority towards Yeon-hee grows by the day, and she eventually makes a drastic decision to bring the two lovers down.

Take a nostalgic trip back to the late 1980s through the lives of five families and their five teenage kids living in a small neighborhood in Seoul.