Behind Her Radiance(2017)

Original title: 그 길에서 우리는

Young-eun, a skeptical high school girl, isolates herself from others through elitism, preferring to be alone by choice than being rejected. One day she finds at her usual solitude spot a boy who is alone like her, but for the opposite reason: he cares about how others behave towards him. They walk by the cherry blossoms together.