- Name: Jang Do Yoon (장도윤 / チャン・ドユン)
- Stage Names: Do Yoon (도윤)
- Birthdate: August 31, 1995
- Blood Type: O
- Education: School of Performing Arst Seoul.
- Favorite Artists: Lee Seung Gi
- Hobbies: Tennis
- Pledis Entertainment (2011-2014)
- JB entertaiment (2014-present)
-  MIXNINE
-  Happy Pledis - "Love Letter" (PLEDIS BOYS Version)
-  NU'EST - FACE
-  Hello Venus - Venus
-  PLANET BEAR - "The Road"
-  KBS2 Happy! Rose Day
-  tvN Do not Cry Bird
-  Hiya
-  Because I Love You
- It has been called "the next Jung Yonghwa.
- It is very picky eater (do not like vegetables)
- Since I was young his dream was to become an actor.