Seo In Guk showed his 'beast' charm through his muscular legs.

Seo In Guk was recently chosen as a sports brand model with girl group SISTAR.

He wore tight clothes and sat on the floor. He had smokey eye makeup and revealed sexiness through the tight outfit. His shorts were a little too short, but he was able to pull off even that outfit.

Internet users who saw this commented, "If I wear that, it would be embarrassing," "He's getting sexier and sexier," and "He wore something girl groups would wear."