Serin (세린) is a South Korean singer. She is a former pre-debut member of Moonlight Girls. She was also the rapper and the maknae of the girl group BaBa under the stage name Maum (마음). She was added to the lineup of the girl group BaBa in December 2017 and made her official debut with the group on July 3, 2018 with their third comeback "Oh! My God!". She was the new maknae of the their 2017 lineup. However, later on in the same year, she left the group. In 2019, she became a part of the girl group Moonlight Girls as Serin (세린), but left before their debut.