About Mark (rapper)
Mark Lee, known mononymously as Mark, is a Canadian rapper and singer based in South Korea. He is a member of the South Korean boy band NCT and its fixed sub-units NCT 127 and NCT Dream, as well as the South Korean supergroup SuperM. In April 2016, SM Entertainment confirmed that Mark and four other members of SM Rookies—Taeyong, Doyoung, Ten and Jaehyun—would debut as members of NCT's first sub-unit, NCT U. The same month, Mark appeared in the first season of the music variety show Snowball Project. They released their first digital single on April 9, titled "The 7th Sense", in which he and Taeyong participated in songwriting. This marked his first solo endeavour since his debut in NCT.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.