Homemaker Shim Su-ho goes to look for a parcel and runs into a very young and handsome apartment security guard Ki Sang-hyeok. Critical Hit! Su-ho, who fell in love at first sight, rushes to Sang-hyeok. But this relationship, somewhere... not enough… ? Gags, love, and even thrillers. It's a painful story for the person who sees it, but it's a fun story for the viewer!