WinWin (Korean: 윈윈, Simplified Chinese: 昀昀), born Sicheng Dong (Chinese: 董思成), is a Chinese singer and dancer. He is the lead dancer, lead rapper, sub vocalist, and visual of the Chinese male idol group WayV. He is one of the members of the South Korea based male idol group NCT and its sub-units NCT 127 and NCT U. In 2021, he established a personal studio for his acting activities in China.
Usually comes off as cold since he doesn't talk a lot but he's a sweet person.