He later joined the Pegasus academy where he helped his side to win the 2014-15 Hong Kong FA Youth Cup.

[8] On 3 February 2016, Wu made his first team debut in a 2015–16 Hong Kong FA Cup match against his former youth club Wan Chai.

[9] On 12 June 2019, Wu announced that he would be leaving Pegasus after six years in order to challenge himself at a new club.

[13] Despite having yet reached the age of 16, Wu was selected for the Hong Kong U-18 squad that competed in the 2014 AFC U-19 Championship qualification tournament.

In July 2017, Wu was selected for the Hong Kong U-22 squad ahead of the 2018 AFC U-23 Championship qualification tournament where he appeared in all three games.