MONSTA X are all smiles behind the scenes of their album photoshoot!

MONSTA X may be brooding and serious on stage, but they're always full of smiles behind the scenes as we can see from the newest jacket photoshoot cuts! 

The boys, who are gearing up for a comeback with 'The Clan Part. 1 - Lost', have revealed some bright, behind-the-scenes photos from the set of their red, moody teaser images, gifting us with such charming little smiles!

'The Clan Part. 1 - Lost' is set for release this coming May 18! Check out MONSTA X' album highlight teaser and MV teaser if you missed them!