Who's going to let down their guard first? A pretty art tutor VS a muscular and young personal trainer?  This sex-less couple's secret tutoring starts now between a pretty art tutor VS a muscular and young personal trainer.  Baek-seon and Soo-kyeom are sex-less couple who have been living with each other for 20 years out of loyalty.  The two decide to find a hobby for some fun in their lives. Soo-kyeom decides to get personal training and Baek-seon decides to get some art tutoring.  Oh dear, they meet handsome and young personal trainer In-hak and pretty art teacher Ji-won!  The couple is soon more interested in getting action than getting lessons.  What will be the end of their secretive lessons?