Xu Nuan is a "snail" nestled in his own shell, hard on the outside but soft on the inside. Yu Qing is the sunny, warm, confident "Mr. Dolphin". Together they find the Yu family's long-lost eldest son Jiang Shu, who is Xu Nuan's childhood sweetheart. One of the two treats Xu Nuan with care and tenderness as a lover, and the other accompanies Xu Nuan through the pain of his life as a family member.
