As summer has arrived, we've put together the names of the three stars, who showed their toned abs in their dramas: Song Joong-ki, Kim Woo-bin, Yoon Si-yoon. ◆ Song Joong-ki, 'hotter than the sun', Mirror of the Witch, Nice Guy, Uncontrollably Fond, Kim Woo-bin, Song Joong-ki, Yoon Si-yoon