Jeong Hoon, who is looking back on his life because of his wife who committed suicide without a will, finds the meaning of happiness that his wife longed for, and visits the sea of memories where he found Geon Hee. A short but intense relationship continues with Geon Hee, who had been struggling with her daughter after divorce with her husband, and she smiles for the first time, and Jeong Hoon feels the small happiness Geon Hee gave him on his bus returning home.