Two-year-old mute Shen Yiran is nearly sold by her stepmother despite her three brothers' resistance. After the eldest brother becomes disabled and their biological mother takes them away, they spend eighteen years searching for their sister. When adult Shen Yiran's scammer boyfriend betrays her, second brother Cheng Shangli rescues her. After workplace harassment from secretary Yan Sisi and identity theft by Shen Nanqing (who gets mistakenly recognized as the lost sister), third brother Cheng Jueyi's technical proof reveals the truth. Just as they reunite, their biological father kidnaps Shen Yiran for ransom. The brothers rescue her, cure her muteness, and achieve a happy ending.