Recently, SBS's 'Strong Heart' revealed a teaser of their upcoming episode, which features some very special guests. Through the preview, it was revealed that TVXQ's�Yunho and Changmin will appear on the February 8th episode. It's looking like viewers will get a great dose of TVXQ's charms through their dance and stories. Yunho will even pull off a surprising tongue trick! Check out the clip below!