Wong Yuk Hei (黃旭熙) (read as Huang Xu Xi in Mandarin), better known as Lucas (루카스) is a Chinese singer, based in South Korea. He is a member of the boy group NCT.
He was born on January 25, 1999 in Hong Kong. He was born to a Chinese father and a Thai mother.
In April 2017, he was introduced as part of SM Entertainment's pre-debut training team SMROOKIES, and in the same month, he was featured in Ten's "Dream In A Dream" music video, released for SM STATION.
He officially debuted in 2018 as a member of NCT with NCT U's single "BOSS".