Seventeen's Joshua and Vernon made a surprise guest appearance for a session of 'Genius Open Mic' to perform their unit track, "2 Minus 1"!

Released back in October as a part of Seventeen's 9th mini album 'Attacca', "2 Minus 1" is Seventeen's first ever English-language track, sung by members Joshua and Vernon. For their 'Open Mic' performance, the two Seventeen members chose a refreshing, rooftop stage overlooking Seoul, rocking out with a live band. 

Check out Joshua and Vernon's pop punk performance of "2 Minus 1", above!