Three years ago, Su Xiaobai was a girl who blushed even when she spoke, but she once liked someone so much that she could go to KFC to get drunk, jump off high walls, fry vegetables for him... And even changed herself.
Maybe it's trivial, but that's the only way she can get close to him, even if it's not her he reaches out to.
In this world, there are wishful thinking and wishful thinking. She finally took her pale youth to the far south. At the class reunion three years later, she came back with a sunny smile. Was she a sparrow or a swan? Three years of hard work have made every student change a lot.
When the truth has been revealed and the classmates at that time are suspicious of each other, is a reunion after three years really that simple? Su Xiaobai, Han Chang, Bai Chuxiao... What truth is buried in their stories in the bleakest autumn?
Will love really die with youth, like fallen leaves after autumn that eventually wither and grow in the mud?
Perhaps, even after many years, what we will remember after many changes will always be our past selves, the unforgettable youthful smile when we pass each other by.