8년지기 부X친구 진예건을 짝사랑 중인 강효인. 오랜 짝사랑에 나사가 하나 빠져버린 효인은 예건의 애인이 되기 위해 철저한 계획을 세운다.   하지만 그런 노력이 무색하게도 기억도 나지 않는 하룻밤으로 예건에게 삥 뜯기듯(?) 얼렁뚱땅 연애가 시작되는데...   잠시만, 그래서 어제 우리 둘 중에 누가 깔린 건데? 설마 내가 깔린 거야?!   Kang Hyo-in has been secretly in love with his best friend of eight years, Jin Ye-geon. So smitten that he’s practically lost a screw, Hyo-in comes up with a meticulous plan to finally become Ye-geon’s boyfriend. But all his careful effort is rendered pointless when, after a one-night stand he barely even remembers, their “relationship” suddenly begins—more like Ye-geon squeezing it out of him than anything else(?)!   Wait a sec… so between the two of us, who was on the bottom last night? ... Don’t tell me—it was me?!