For eighteen years, Lu Yunzhao doted on her adopted daughter, Xie Mingzhu. But while in Southeast Asia, she encountered a girl with a butterfly-shaped birthmark on her collarbone, identical to the one her biological daughter had. Suddenly, the words her best friend had spoken eighteen years ago, "You must have seen it wrong," began to haunt her. She secretly sent some strands of hair for DNA testing. At a cruise ship banquet, Mingzhu publicly acknowledged her best friend as her mother and demanded that Lu Yunzhao bow her head and apologize. Lu Yunzhao asked her, word by word, "Are you really my daughter?"