SEOUL, Nov. 2 (Yonhap) -- K-pop girl group LIGHTSUM has been appointed an honorary ambassador for Korea Post savings, Cube Entertainment said Monday.

LIGHTSUM attended a ceremony held Friday at Seoul Central Post Office to mark the appointment.

"We are truly honored to be joining through this great opportunity," the members said. "We will work hard to promote Korea Post savings widely."

The group released "What Do I Do," the Korean-language version of the title track from its Japanese mini-album "Re:idol," on Oct. 22.

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