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Kim Jeonggyu, also known as SC4F, is a South Korean rapper born on October 8, 1997. He made his debut in 2021 with the EP Eternal Flame, a collaboration with fellow rapper MADII. Together, they released several singles and EPs, including "Lifestyle" (2021), "Sun Down" (2022), and Twin Turbo Vol. 2 (2022). The track "B.F.M (Bad for Me)," released on the single album RINGTONE MUSIC: Pt. 2 on September 11, 2025, entered Melon's Top 500 chart at number 273 on September 22.
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