Both Ying and Yaya are born with a single eyelid.
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Boboiboy Headcanons
RandomAccording to fanlore: Headcanon (or head canon, head-canon) is a fan's personal, idiosyncratic interpretation of canon, such as habits of a character, the backstory of a character, or the nature of relationships between characters. The term comes fr...
Monolid
Both Ying and Yaya are born with a single eyelid.