In the upcoming episode of MBC's 'Quiz to Change the World - Finding Friends', Fly to the Sky's Brian found himself quite flustered with the topic of his past relationship.

When the topic of Brian's past relationships, Suh Jang Hoon mentioned, "I heard that Shin Dong Yup caught Brian on a secret date in the past."

Shin Dong Yup said, "The [female he was with] is such a top star that I should really be careful about talking about this..." 

Brian added, "We definitely double checked our surroundings, but we still got caught [by Shin Dong Yup]." Shin Dong Yup teased, "I described it as a kiss to tone it down, but really, it was totally a public display of affection."

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Are you curious as to who this 'top star' is?

Hopefully you can get more clues by catching the episode on April 11 at 11:15pm!