A prominent figure in Cantopop and Mandopop, he has written lyrics for nearly all major Hong Kong singers, with notable collaborations with Leslie Cheung, Faye Wong, Eason Chan, and Miriam Yeung.

After attending a rally against Hong Kong's moral and national education plan in 2012, Leung became active in social movements.

His pen name, 林夕, comes from the last name of lyricist Richard Lam and the simplified Chinese character 梦 (meaning "dream").

[6][7][8] On TVB's show Be My Guest, he admitted that his fastest record for writing the complete lyrics to a song is 45 minutes.

[1] Since 2017, he has been blacklisted in mainland China and criticized by state media for his support for the Hong Kong democracy movement.