MXM has dropped their teaser video for "Knock Knock".
MXM's double title tracks will be "Knock Knock (TAK Remix)" and "You Look So Different", which member Kim Dong Hyun took part in composing and writing. Kim Dong Hyun also has a solo song in the single album called "Serenade".
Check out the "Knock Knock" teaser video above.
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