Yun Seo-young, known professionally as YSY, is a South Korean rapper-songwriter and dancer under Chapter-I. She is the leader of the girl group H//PE Princess, formed through the 2025 survival show Unpretty Rapstar: HIP POP Princess, and a former pre-debut member of the girl group VVS.
She made her solo debut on June 25, 2024, with the collaboration single "Love Me No More (Remix)".
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