MAMAMOO is joining the heated November comeback competition as they are going to battle against Hello Venus, AOA, and A Pink this month.

MAMAMOO is coming back with a classier and more mature look as they will release their new album entitled 'Piano Man.' For their teaser photo, Solar, Wheein, Moonbyul, and Whasa are looking great as they wear white colored suits.

Originally, MAMAMOO's album was scheduled to be release on November 20. Unfortunately, fans will now have to wait one more day from the scheduled date because they will have a delay.

MAMAMOO posted a tweet on their official Twitter page on November 10th.  "Hello, this is MAMAMOO! Our album was scheduled to be released on November 20th, but has been delayed to the 21st due to the music video production.. You understand this is so we’ll meet everyone again with a better look? We’ll meet next week!"

MAMAMOO will be making their comeback after an impressive debut with their single titled, "Mr. Ambiguous" on June 18, 2014.