Su Wan and Qin An have been childhood friends since they were young. They enter university together, only to find themselves pursued by unexpected newcomers. The sunny upperclassman Gu Yichen comes on strong, while the scheming upperclasswoman Xia Xiaorou plots against them at every turn, stirring up one complication after another. Yet no matter how stormy things get, Su Wan and Qin An continue to trust each other and work in perfect sync to resolve each misunderstanding and crisis. On the canvas of youth, they write the longest confession of love through their constant companionship, and eventually realize that no matter how many newcomers appear, nothing beats hearing, “I'll always trust you.” This is a sweet journey of devotion, protection, and growth.