Recently, the American actor made his second guest appearance on MBC's 'Infinity Challenge' and brought much laughter during the segment where he had to sing K-Pop songs for the members to guess. One of the tracks Jack Black sang was ''Red Flavor'' (seen in the video above).

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The members of Red Velvet shared their reaction to Jack Black singing their song on the August 23 airing of SBS Love FM 'Kim Chang Yeol's Old School'. 

The girls stated, "We were so surprised because he was so good. It was exactly the same and he expressed it very well." DJ Kim Chang Yeol commented, "You must've been touched that a world star has sung your song."

Red Velvet replied, "We hope our song gets spread wide across overseas."