Jiang's father passes away, and cousin Zhang Dehai usurps the family property. With her younger sister gravely ill and in need of money, Jiang Li signs a bet-on agreement to work as a caregiver in a sanatorium for a full seven days, otherwise her debt will become four million. A mysterious old man hides the mystery of her family's decline. Zhang Dehai sets a trap, and Shen Fenglan rescues her. Jiang Li unites with everyone to gather evidence, exposes the villains, reclaims the family property, and saves her sister.