Hyunsoo, a college student, has a trauma to her ex-girlfriend. One day he buys a female mannequin to paint. However, it wasn't a mannequin that Hyunsoo bought, but a cutting-edge sex robot. Hyun-soo's ex-girlfriend Min-ji feels jealous when she sees him after having a hot night with Lara. When she meets Minji again, Hyun-soo presents Lara the sex robot to her father, Cheonsu, and she experiences a new world from Lara.
Young-suk's father, Dae-sung, is the one who will soon become your stepmother and introduces Hitomi to Young-suk. Hitomi is a young lady of twenty-five who is two years younger than Youngsuk. Young-seok's younger and sexy stepmother Hitomi keeps beating more and more. Then one night, Hitomi comes into Youngsuk's room and takes off his pants...?! Dad begins a breathtaking double life with a Japanese mother you should never know.
