Last Post: 2:01:58pm, 02/05/2023
Not that uncommon, or at the very least, it happened with Red Velvet. Irene was 24 when Yeri joined the group at only 16.
Currently in LE SSERAFIM, Sakura is also 24 with Eunchae being 16.
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"Key which hides the powers of darkness... Show your true power before me. Under the contract, Sakura commands you. Release!!" - Sakura Kinomoto