In his early years, Jack Wu grew up in Lei Muk Shue Fire Services Quarters, Wo Yi Hop Road, Tsuen Wan District.

Jack Wu's wife was Hong Kong TVB artiste now Social Media Influencer June Chan Kei.

The two started dating after playing the role of sister and brother in the TV series The King of Yesterday and Tomorrow, and they had known each other for more than ten years.

[7] Jack Wu later participated in the singing competition at the fire station party and eventually won the championship.

A few months later, he received encouragement from his mother and was attracted by the car prize, so in 1996, with Daniel Chan’s song "Knowing Everything About You" 《了解你的所有》 he went to Hong Kong Cultural Center in Tsim Sha Tsui to participate in the Big Echo Summer Karaoke Competition hosted by Go East Entertainment, winning the championship and signed as a singer under Warner Music Hong Kong.

Lau Lai Ping (Apple姐), chairman of the board of directors and boss of BIG ECHO I-BOX, knew that Jack Wu had worked hard to develop his singing career, so she suggested that he find another way out by becoming an artist at TVB.

Later, because he wanted to develop in many aspects, he recommended himself to the producer Leung Choi Yuen to film his first TV series Lost in Love.