Park So-hee, from Doctors Without Borders, disguises herself as a soon-to-graduate college student to repay Shin Mi-sook, who once helped her, and becomes Han Do-won's tutor. Do-won looks down on So-hee and boasts he'll kick her out in three days, but she stands her ground. His friends suggest he seduce her, saying his father will then kick her out, but So-hee instead traps Do-won in her own scheme.