At her grandfather's funeral, Lu Wanqing receives only the code "604", drawing mockery from her relatives. Following the clues, she finds the safe key in the old house, and upon opening it, she is astonished to discover fifty million in assets and an account book secretly protected by her grandfather. Facing her academic advisor's frame-up and her family's greed, Lu Wanqing clears her grievance with evidence, takes back everything that rightfully belongs to her, and achieves self-growth and reconciliation.