Kang Hye-soo (Uee) is a single mother who struggles to raise her daughter while paying off her late husband's debts. Han Ji-hoon (Lee Seo-jin) is the son of a chaebol who seeks a contract marriage in order to save his mother, who needs a liver transplant. When Hye-soo is diagnosed with an inoperable brain tumor, she agrees to marry Ji-hoon and donate part of her liver to his mother, in exchange for enough money to provide for her daughter until she reaches adulthood.
