Koo is a brilliant but broke 23-year-old university student and secret high-end escort. In university, she is the ideal studious student who openly shows disgust toward her arrogant, flirty rich professor Kim Taehyung, while he becomes increasingly irritated and obsessed by her rejection. One night, Tae hires an escort agency’s top escort for a high-paying session and is shocked to discover it is Koo — using the opportunity and their existing hate-filled tension, he turns their relationship into a filthy, addictive secret affair that slowly transforms from pure lust and power play into something neither of them can walk away.