Zeno Koo Ting-hin (Chinese: 顧定軒; born 19 September 1994) is a Hong Kong actor and singer best known for his roles as Ben Chu in the TVB romance series Life After Death (2020) and King Cheung in the ViuTV sports series We are the Littles (2021).

[2][4] Koo studied at Yan Chai Hospital Law Chan Chor Si College [zh],[5] and while in secondary school, he signed with a modeling agency, First Cast, and had appeared on the cover of Yes!

[3][6] After graduation, Koo was recommended by his class teacher to enroll in a two-year acting program at the Hong Kong Academy for Performing Arts.

[13] However, he did not receive any acting roles for the subsequent three years, during which time he worked as a construction worker, customer service representative, and chef to make a living.

[14][15] While filming the latter, he was invited by his co-stars Leung Yip, Denis Kwok, and Jeremy Lee to join ViuTV's variety show King Maker III,[9] where he proceeded to the round of 20 before being eliminated.