Wong Yukhei (黃旭熙), better known by his mononym Lucas (루카스), is a model, rapper, and singer under SM Entertainment / Label V (WayV). His birth name, simplified as 黄旭熙, means yellow prosperous bright sun.

Lucas is of Thai (Mom) and Hong Kong (Dad) descent, born and raised in Hong Kong. His native language is Cantonese. He's fluent in Mandarin, Korean and can hold a conversation in English and Thai.

Lucas was first officially introduced to the public as a part of SMRookies on 06/04/2017. He was then announced as a member of NCT 2018 on 30/01/2018 and debuted with the song Boss with NCT U on the music show M Countdown on 22/2/2018.

Lucas was also debuted as a model on 19/10/2018, Seoul Fashion Week as his first runway. On 31/12/2018, he was revealed to be a member of WayV - a Chinese unit of NCT - and officially debuted with the group on 17/01/2019. On 08/08/2019, SM Entertainment revealed the supergroup SuperM that consists of SHINee, EXO and NCT members, in which Lucas is included. SuperM debuted on 04/10/2019.

On May 10, 2023, SM Entertainment made an announcement stating that Lucas will be departing from WayV and NCT to pursue a solo career.

黃旭熙