Aria is a simple college student living with her mother and younger sister, who has a heart condition. Their lives take a turn when their savings for her sister's medicine are stolen, pushing Aria to seek desperate measures. Out of options, she sells her body to a wealthy and beautiful woman. What begins as a ten-months-night transaction evolves into something deeper as the woman starts helping Aria's family and showing care beyond their arrangement. However, as emotions blur, Aria must confront whether she's paying with more than just her body-perhaps even her heart. The Professor's Secret