Group Super Junior's member Choi Siwon showed off his muscular body in 'Infinite Challenge.'

In MBC "Infinite Challenge" aired today, the members competed against Choi Siwon playing basketball. Because of the hot weather, Choi Siwon took of his shirt in the middle of the game, showing off his muscular and fit body.

Those looking at him smiled as if they were happy to be seeing him half-naked, and realizing that the camera was filming him, Choi Siwon shyly put his shirt back on.

Photo Credit: MBC