Lee Dong-hyuck, known professionally as Haechan (해찬), is a South Korean singer. He is a member of South Korean boy band NCT and sub-units NCT 127 and NCT Dream.

NCT is a South Korean boy band formed and managed by SM Entertainment. Introduced in January 2016, the group currently consists of 26 members divided into six different sub-units: NCT U, NCT 127, NCT Dream, WayV, NCT DoJaeJung, and NCT Wish. They are known for their versatility in music, vocal and rap abilities, and powerful performances, and have been cited as K-pop's "most experimental boy band" due to their concept of having limitless members. As of May 2023, NCT has recorded more than 32 million album sales across all sub-units, making them the best-selling act under SM Entertainment and one of the best-selling K-pop artists of all-time.