Transfer student Su Wan came to the new class with her father's psychology notes, and her silent appearance hid unhealed wounds. Until she met Gu Yang, who was as cheerful as the sun - he quietly warmed her notebook with sycamore leaf bookmarks and hid the bloodshot handkerchief where she couldn't see it. They use each other's warmth to warm up the cold winter, but they don't know that some promises are destined not to wait until spring.
This is a story about redemption and regret, about how two souls who illuminate each other in the darkness use a brief warm sun to warm each other's long cold winter.
