My best friend, Sa Ji, sent me his private sex tape saying it was a "thank you for always borrowing my notes," but then he messaged me saying, "It was sent by mistake, please delete it." However, I couldn't suppress my curiosity and secretly checked the contents. And there... was my mother!? My head went into a panic, and as I lacked the courage to confirm the truth, days just passed by. Then one day, when I returned home, there was a strange atmosphere...