Because of a family crisis, Qin Huai'an takes his elder brother's place in marrying into the Jiang family and lives there for three years. Throughout those years, he gives Jiang Wanqing all his tenderness and devotion, but her heart remains attached to her idealized first love, Zhao Jinghui, and she turns a blind eye to everything Qin does for her. When the three-year term ends, Huai'an finally lets go of his obsession and leaves for Haicheng, where he runs a coffee shop and heals his wounds alone. There, he happens to meet the gentle and kind Su Nianzhen, who gradually helps him heal. When the real Qin Huaijin returns, his personality is different, and Jiang Wanqing finally comes to her senses. Only then does she realize she has lost the most precious person in her life. She wants to find the man she has truly loved over the past few years, but she does not know that, where the sea breeze blows, the vows have already come too late. Living peacefully apart is its own kind of sunshine.