The currently airing My Princess featured Bidam as one of Seol's (Kim Tae Hee) teachers.

In episode 14, she begins her lessons with Hae-young’s replacement, and when he presents her with her new study schedule, she decides she doesn’t like it. She writes up one of her own, which includes: “History: Nam Jung-woo. Economics: Steve Jobs. English: John Park. Music: Beast, Rain. Fashion: Shinee. Horseback Riding: Bidam.” (Recap by Dramabeans)

From previous episodes, Mishil (played by kho hyung jong) was shown as cameo and also Joo Sang Wook as bodyguard.
Would it be better if Bidam will have a cameo? Haha <3

source: http://media.daum.net/entertain/all/view.html?cateid=1005&newsid=20110217114635438&p=tvreport