After competing in the "New Artist Fight Game" competition in 2000, he was subsequently signed to Virgin Music. Within half a year, Wu released his debut album Tomorrow, Alone (一個人的Tomorrow). Despite the involvement of top producers, the album received lukewarm response and weak sales. However, this gave him opportunities to act in Taiwanese drama such as Peach Girl and Moonlight Forest. During his time acting, he continued to perform songs he wrote and composed at pubs.