Jason Koo is a Chinese singer and actor. He is part of the Chinese idol group, X-NINE, as main rapper.
DETAILS:
- First Name: Jia Cheng
- Family Name: Gu
- Native name: 谷嘉诚
- Also Known as: 谷嘉誠;Jason Gu;Jason Koo;毛毛;老谷;Gu Jia Cheng
- Nationality: Chinese
- Gender: Male
- Born: June 19, 1992
- Age: 28
