He rose to fame after winning ViuTV's reality talent competition Good Night Show - King Maker in 2018.

[6] In June 2019, Keung made his solo debut with the release of "Seed No.1" (一號種籽),[7][8] quickly climbing the mainstream pop music charts, topping at third place.

In contrast with the styles of his previous songs, the lyrics for this single evokes a deep sadness, revolving around Keung's personal experiences with no girlfriends.

[citation needed] On 19 March 2021, Keung released "Master Class",[18][19] a Reggaeton and Blues song, receiving widespread positive feedback.

In September 2021, Keung announced the completion of the conceptual design of his 9th solo project, which also incorporated a mini documentary series, released via the Mirror YouTube Channel.

Keung incorporated krumping in the choreography of this particular performance to express the angst induced by the sense of isolation and self doubt that came with fame.

Mirror's public activities came to a halt in July 2022 after a serious incident at the group's concert that left two dancers with severe injuries.

All the members, including Keung, had to take a leave of absence, and they only returned to public eye to promote the TV series "We Got Game" in October 2022.

However, on 11 November, Keung suffered an accident during the 903 All Star Basket Game that left him hospitalized with injuries to his knee and Achille's heel, requiring surgery and a prolonged recovery.

During interview at this period, Keung admitted that he had to dig deep to deal with the negativity resulting from the media attacks but appreciated all the criticism which gave him a chance to inspect his own flaws and improve.

He debuted the song live at HKT West Kowloon Music Festival on 2 April 2023, which later Keung described as "one of the most important performances of his career".

He released his twelfth single "Ocean" 《濤》 as the title song for this concert series, and collaborated with master choreographer Mui Cheuk-Yin on a much acclaimed opening medley that infused contemporary and Chinese dance styles into the performance.

"You are out of this world," a tribute to his fans for their unwavering support and "Every Single Time", an R&B influenced love song written by Louis Cheung.

Keung teamed up again with lyricist Siu Hak on his 14th single "Dark Moon", a song about the duality of humanity and how greed and other sins can drive one to give in to the unrestrained desires, and the only path to resist that temptation is to be reminded of one's purest intent.

In 2024, Keung made a special appearance in the heist film The Moon Thieves as Uncle, the unhinged and arrogant son of a deceased underground watch dealer.