There once lived an infinitely beautiful boy in every girl's heart. In that era when love was yet to be truly understood, she quietly followed his figure. Perhaps it was destined to be a fruitless secret love, painful and sweet, but joyful, but that thought had already bloomed in the bottom of her heart. Not every girl is as lucky as Ren Ran, who meets the boy in her memory again many years later, and he happens to have been in love with her for so many years. Not every secret love has a result, but it is destined to be the most beautiful mark of youth.