Super Junior's�Choi Siwon has shared a selca of himself grinning rather forcefully.

Siwon tweeted, "Work's finished. I'm tired after working with people who aren't flexible, but I have to smile." To deliver his point, Siwon then gave a wide, slightly frightening grin for the camera.

Fans commented, "If you smile when you're tired, you'll become happier," and "Those sunglasses don't hide your good looks."

Siwon is currently starring in the Taiwanese drama, 'Extravagant Challenge'.

Source + Photo: Choi Siwon's Twitter