Broadcasted on April 9, boy band�Day6 made a guest appearance on KBS 2TV's 'Yoo Hee Yeol's Sketchbook.'
The boys gave a lively performance of title songs "Congratulations" and "I'm Serious" banging on the drums and rocking out on the electric guitar.
SEE ALSO: DAY6 take the stage in 'Welcome to the Show' live MV
Watch the exciting performances below!
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