It was the summer of 2010. Smartphones just began to appear and wireless earbuds still felt like science fiction. One ordinary morning, Han Young-seo, the top student at her high school, heads to school and slips into a deserted back alley. There, she's caught smoking by Ki Hyun-ha, a classmate who couldn't be more different from the model student she appears to be. From that morning on, two classmates who were nothing more begin to intertwine.
