SEE ALSO: Veteran singer Yoon Soo Il thanks BLACKPINK's Rosé for the revival interest in his classic 1982 song "Apartment"

Before airing the BTS episode of 'Knowing Brothers', Heechul posted a selfie with himself and Suga. The caption reads, "My little brother Suga whom I met through 'Weekly Idol', it's already been 2 years since then...time goes by really fast. Before filming the first episode of 'Weekly Idol', I was told BTS would be appearing so I decided to look them up and while doing so, I became a fan ('Dope' MV was really dope and 'I NEED U' smashed my sensitivity). Also, I heard Suga and Heechul's chemistry was unreal today. You can check out the chemistry today through 'Knowing Brothers'."

Don't miss out on the two artists' chemistry on 'Knowing Brothers'!

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A post shared by Kim Hee Chul (@kimheenim) on Sep 22, 2017 at 7:58pm PDT