류 세라 - Ryu Se-ra

Note about Sera's peculiar two birthdays: "...before her parents gave birth to Sera, they thought they would give birth to a boy, so they prepared a male name for their baby. But then it turned out to be a girl... So they had to think of another name for the baby thus they submitted the ID registration (family registration) 1 month later (Oct 3), so on Sera’s ID, her birthday is stated as Oct 3." - translation credit to kyungri_trans.