Youth is a tightly woven network, and the sadness of youth is the lingering lines in the palm of your hand. Su La's youth is bright and sad, Wei Xi's youth is unforgettable, Xiao Mo's youth is like a curtain of falling rain, and Yu Feng's youth is an impulsive age locked away. Sura said that she would never return to City X, the place that had given her the pain and joy of growing up, but was now filled with the pain of her heartbreak; and Weixi, he would never leave City X, because his sweetest memories were stored in this city.