Cassies have been ecstatic over the preview for next week's episode of SBS's "Running Man", as it featured cuts of their favorite idols, TVXQ! The episode centers around the musical, "The Phantom of the Opera", as castmates have to run around an opera house to catch the two masked musicians. Not only are they masked, but they're also cloaked as well, which heightens the masculine appeal of Yunho and Changmin. It'll be TVXQ's first variety show appearance in two years. Fans can catch the episode through SBS on January 23rd at 5:20PM KST. Meanwhile, TVXQ are also scheduled for a 'Strong Heart' recording on the 20th and the estimated broadcast date is set for February 8th.