Yonni and Chiae
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Yonni and Chiae are a sibling duo who run a YouTube channel together. Hong Won-ki, also known as Yonni, is the only person in Korea diagnosed with progeria, a condition that causes accelerated aging. His sister, Hong Su-hye, is Chiae. Unlike her brother who is 138 cm tall at 19, Chiae is 180 cm tall at 17. Yonni has a talent for piano and regularly uploads piano cover content, while Chiae is skilled at beautifully combining music and video production. Since November 2018, they have been actively sharing content online. In December 2023, the duo released their debut single "I'm An Alien," and since then, they have released a total of nine singles. Their single "Soulmate," released on July 4, 2025, entered Melonâs Top 500 chart at number 20 on the day of its release.
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