Wong Yuk-hei (Chinese: 黃旭熙; born 25 January 1999), better known by the mononym Lucas (Korean: 루카스) is a Hong Kong rapper, singer and model of Thai and Chinese descent. He is a member of the South Korean boy group NCT, its Chinese sub-unit WayV and rotational sub-unit NCT U, as well as the supergroup SuperM. In China, he has appeared as a regular cast member of the seventh and ninth season of the popular variety show Keep Running.