Xia Zhi, an enthusiastic and bright art student, and Lin Yu, a cool and taciturn academic student, became friends under a locust tree in high school over a physics question. She secretly filled out her application form next door to his target university, looking forward to going to the north to watch the snow together after the college entrance examination; he drew a little sun in the corner of the draft paper, hiding his unspoken concerns. However, after the college entrance examination, Lin Yu quietly left due to family changes, leaving only a scrap of paper with "I'm sorry" written in half. Many years later, Xia Zhi came across a painting called "Sophora Summer" at an art exhibition. In the painting, she saw herself under a locust tree, familiar brushstrokes, and the ambiguous word "Yu" in the painting, revealing the regret that the two never met again - they ended up living in each other's summer memories and never crossed paths again.
Motto: Don't regret