After Leessang's Gil suffered a mental breakdown on Twitter following yesterday's broadcast of 'Infinity Challenge', his musical festival partner BoA apologized to him for being a victim of a prank the entire cast pulled on him!

BoA had promised to give Gil a kiss if he could pull off his dance moves correctly at Saturday's 2013 music festival. However, unbeknownst to him, Yoo Jae Suk was the one who kissed him instead!

SEE ALSO: Check out the performances from the '2013 Infinity Challenge Music Festival'!

The rest of the cast members kept mum on the bait-and-switch, leaving Gil to only find out what happened when he watched the aired episode.

Unsurprisingly, Gil's mind was blown. "Who do I need to sue?" he posted on Twitter shortly after the broadcast. "Grasshopper hyung? Kwon BoA? Or everyone? Sigh. Enough. I'll just have a drink and comfort myself."

BoA replied to this outburst by asking for forgiveness. "S, s, sorry," she posted.

Although it definitely wasn't what he expected, at least he got a kiss from the Grasshopper himself -- which, we're sure, is something a lot of his fans pine for!