On August 7, the actor Instagrammed a blurry picture of himself caught in the act as he wrote, "Desperate moves to overcome the generation gap. The consequences of 'Bar Bar Bar'."
The picture shows Yoo Ah In on the far right, getting ready for the jumping part of the song's choreography. The blurry picture told viewers how hard the star was trying to perfect the dance.
After seeing his hilarious update, fans commented things like, "Yoo Ah In looks like he's really having fun," and "Yoo Ah In joined the 'Bar Bar Bar' fever too."