Their label revealed, "Out of the original 4 in MIXX, Henny has left the group, and new members Heeyu and Mia will be joining the group to make a 5-member group."
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The girls debuted in May this year, with 3 Chinese members and 1 Korean member. Heeyu, one of the new members, is from 'Survival: Finding Momoland' while Mia has been in various MV before her debut, and she boasts an impressive height of 174 cm (5'8").
The girls will be coming back in the first week of January with the new members.