After being diagnosed with a possibly terminal brain tumor, Kang Hye Soo, a desperate single mother, agrees to be a liver donor for her new boss’ mother. In exchange, she will receive a significant sum of money that she hopes to leave to her daughter. In order to pass the screening process, they must legally wed and convince the hospital that they’ve been in a long-term relationship. What they foolishly thought would be a quiet transaction between the two of them, quickly becomes more complicated as more people get involved, including her 7-year-old daughter. Money isn’t the only thing required for happiness, and love makes life worth living.