Who is going to let their shield ? Quite a art trainer VS trainer that is young and a muscular? This couple's secret tutoring starts between a art tutor compared to young trainer and a muscular. Soo-kyeom and baek-seon are couple that have been living with each other for 20 years outside of devotion. The two decide to discover a spare time activity. Soo-kyeom decides to find training that is personal and Baek-seon decides to find some art tutoring. Oh dear, they meet art teacher Ji-won that is pretty and young and handsome trainer In-hak! The couple is more enthusiastic than becoming lessons in getting actions. What will be the end of their course?