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We're used to idol groups coming together for special performances or advertising campaigns, but how about to make a domino run?
Boy bands Teen Top and 100% built a huge 12,000 piece domino line as part of a teamwork mission, and special finale episode, for their reality show.
The collaboration for today's finale episode MBC's Rising Brothers was the culmination of several weeks of challenges to prove themselves as "real men" and get awarded with a certificate.
"This is amazing," Teen Top's Niel, 18, shouted as the thousands of dominoes were knocked down one by one. "So cool!"
Both bands belong to the same agency, Top Media, but that hasn't stopped rivalry between the members during the MBC series.
"We're on the same side but I still feel competitive about the others," band mate Ricky, 17, has said. "I want to be the best out of everyone."