Winwin (윈윈) is a Chinese singer under SM Entertainment. He is a member of the Korean pop boy group NCT and its sub-units NCT U, NCT 127, and WayV. He was formerly a member of the pre-debut team SM Rookies.
- Stage Name: Win Win (윈윈/昀昀)
- Birth Name: Dong Si Cheng (董寺丞)
- Birthdate: October 28, 1997
- Birthplace: Zhejiang, China
- Blood Type: B
- Height: 180cm
- Weight: 60kg
- Secondary School Of Beijing Dance Academy (Graduated)
- Central Academy Of Drama (Current)
- He lived in Beijing for 7 years.