My Personal Trainer (2019)

YouTuber Jin-ho starts going to the gym to collect subscribers. But somehow he's more interested in the good-looking trainer Seok-hoon than in his shape. Looking at Seok-hoon, who is exceptionally friendly, Jin-ho is sure that Seok-hoon is also in love with him. Then, Seok-hoon and Jin-ho met in the shower: "Are you free today?"