JYP Entertainment has just released a statement that a 6 member Wonder Girls including Sunmi is definitely ok! JYP Entertainment stated:

"We did not expect Sunmi to withdraw from the group and all of our commitments stated that the Wonder Girls are a 5 member group. Furthermore, the parties that we had commitments with all showed disapproval to a 4 member Wonder Girls. We had discussions with the 4 members, who all agreed to Hae Lim joining, which is why the decision was made."

"Although there is an issue with the Wonder Girls becoming a 4 member group after Sunmi's decision to leave, later on, if Sunmi wishes to return as a member of the Wonder Girls, there are no issues with the group gaining an additional member. If Sunmi wishes to return later on, we will respect her decision as well as the other members' decisions and follow."

"We cannot agree to this statement that 4 members are an issue but 6 members aren't."