HANZ (한즈), born Kim Doohan (김두한) on January 11, 1999, in Ilsan, Gyeonggi-do, South Korea, is a singer-songwriter under East Blue. A former member of the vocal group OUTRO (2019–2020), he first gained public attention as a contestant on Sing Again 3 (2023), where his emotional performances drew wide acclaim. HANZ made his solo debut in 2023 with the digital single "Coldness (with Elliot)" and officially debuted under East Blue with "Falling" in 2024, followed by "Petals of Youth" and "As Flowers Bloom and Fall" in 2025. Influenced by British pop and rock ballads, he is known for his emotional tone, sincere lyricism, and expressive live performances that highlight his versatility and depth as an artist.