Hwa Sa has dropped her first teaser images for 'O'.

The concept photos reveal a sunny day at home and by the pool. 'O' is the MAMAMOO member's upcoming second mini album, and it's her first release since her 7th digital single "Chili" for 'Street Woman Fighter 2'.

Hwa Sa's 'O' will be out on September 19 KST. Stay tuned for updates!   

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