18 Year Old Seungha's Easy Piece of Cake: Min-soo, who just started living in a new home, calls his friends Woo-hyeon and Ji-yeong. The two kiss while Min-soo is away from home. Unfortunately, Min-soo also secretly had sex while sleeping. And Min-soo is watching them... Ji-yeong is provoking Min-soo after learning that he saw her having sex with Woo-hyeon. Who will Ji-yeong fall in love with after having sex with these two people? The sweet and bloody story of a woman and two men is just beginning.