A burst water pipe, a massive rent hike, and a cheating boyfriend. Not a single thing is going right. On a whim, Lee-Sun brings home a man he found passed out drunk on the street and lets him sleep over. Turns out, that man is a rich underclassman from the same university department. And, he secretly has a thing for Lee-Sun...?! "Are you regretting it now that we're living together and you never got to sleep with me?" "Yep." A mysterious man crashes into the everyday life of university student 'Na Lee-Sun', whose life motto is safety first!! A chaotic romance between a psycho beauty x a collector of absolute trash men!