Block B are the latest artists to be featured in 1theK's 'Waitingroom Live'.

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The boys brought all their energy and goofy personalities to a life, waiting room performance of their latest track "Yesterday". As the members yell, the song was produced by Park Kyung, but it's not the only time they get a little hyper. Block B play with props, make faces at the camera, pet their puppies, and more.

Check out Block B's 'Waitingroom Live' above!