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Arno (Arno)
Also known as: Zhang Jiahao, 張家豪, 지아하오, 张家豪
Date of birth: 7 July 2002 (24 years old)
Country: Chinese
Zhang Jia Hao, known professionally as Arno, is a Chinese singer, dancer, and member of ALPHA DRIVE ONE (알파드라이브원; also stylized as ALD1 (알디원)). He graduated from PSB Academy in Singapore with a bachelor's degree in Media and Communication Studies.
He trained at Chromosome (染色体) in China, who is in a commercial partnership with Korean company Nouer Entertainment (누아엔터테인먼트). He first appeared on TV as a contestant in the 2024 reality survival "Makemate 1" but was eliminated in the final episode and ranked 10th overall.
The following year, he entered the survival competition "Boys Planet II" where he finished in 5th place and secured a spot in the resulting project group. They released the pre-debut single, "Formula", in December 2025. He officially debuted as part of ALPHA DRIVE ONE in January 2026 with their first mini-album, "Euphoria". The group is managed by Wakeone (웨이크원) and the initial contract is for 5 years.
