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Kim Yong-sun, known professionally as Solar, is a South Korean singer, songwriter and actress under RBW Entertainment. She is the leader of the girl group MAMAMOO and its sub-unit MAMAMOO+. She made her solo debut with the single Spit It Out on April 23, 2020. She released her first extended play 容: Face with its lead single Honey on March 16, 2022. She also made her debut in Taiwan with the Chinese single Floating Free on June 11, 2025. Solar ventured into musical acting through the musical Mata Hari for its 2022 production. She made her film debut with the role of Mi-yeon in the horror film The Cursed: Insatiable Desires (2025).
