Come to the Energetic Gym!

Could this be love at first sight? His pounding heart was completely reacting to the man standing at the door. It was a thrilling resonance he hadn't felt in a long time. Yeon Ijun, the energetic gym owner, wanted to surrender himself to the uncontrollable trembling. Until Taeyang, a little trainee at the gym, called out to him... "Dad!" The pure voice from above shattered the ringing in Ijun's ears into the sound of crashing, broken plates. "D, Dad...?" * * * His destined one was the trainee's dad, a married man...! Having become someone he shouldn't even look at just 10 seconds after falling in love at first sight, he drew a thick line in his heart. But why does he keep running ...