Park Hee-soon, Jin Kyung, Hwang Woo-seul-hye, Jang Seong-beom, Yoon Bo-ra, Lee Go-eun, Jung Sang-hoon, Lim Han-bin, Lee Joon-ik, Ham Seong-min, No Ji-yoo
A mother and father who are very open and frank with their children about sex find their relationship in turmoil when an old love enters the picture.