The three Tang brothers are orphans. When they return to look for their elder sister, Tang Qiulian, they discover that she married into the Sun family and died in childbirth while carrying her second child, leaving behind her five-year-old daughter, Tangtang. At the engagement banquet, Tangtang's jade pendant is picked up and worn by a mother and daughter, causing the three brothers to mistake the other child for their niece. The pendant responds to blood, and a single drop from the real child can prove her identity. After reuniting with their niece, the three brothers make a wager on the spot. They also uncover the truth about their sister's death, leaving the Sun family consumed with regret.