Jason Koo, Gu Jiacheng 谷嘉诚 is a male Chinese singer and actor. He is part of an all boys Chinese bay X-NINE.


  • Name: Gu Jiacheng (谷嘉诚), Jason Koo
  • Position: Rapper, Visual
  • Nationality: Chinese
  • Birthday: June 19, 1992
  • Birthplace: Kunming, Yunnan, China
  • Zodiac Sign: Gemini
  • Height: 178 cm
  • Weight: 67 kg
  • Blood Type: B
  • Education: Chengdu Sport University
  • Music group: X NINE (Since 2016)
  • Agency: WaJiJiWa Entertainment
  • Occupation(s): Actor and singer
  • Active age: 2016present



  • His nickname is “Lao Gu”
  • His English name is “Jason”
  • He attended Chengdu Sports University
  • His fans are called “Cheng Guan”, which translates to “Urban Manager”
  • He turned down an offer from the University of Oregon to participate on XFIRE
  • He is the quietest member, but his members find him funny when he talks
  • He can speak some English
  • He played the male lead in X- NINE’s second webdrama, “Oh! My Emperor”
  • He wrote his own rap verse in -X NINE’s song “Fervor”
  • He loves basketball & the NBA.
  • He likes to collect novelty gadgets and small toys
  • His mom calls him “Mao Mao”
  • He wanted to be a pilot since he was a child but stopped because of his eyesight
  • When he travels he enjoys extreme activities like diving, paragliding and skydiving
  • He recently revealed that he owns a dog


TV Series

  • Twelve Legends (2020)
  • The Song of Glory (2020)
  • Dive (2019)
  • Battle Through the Heavens (2018)
  • Oh! My Emperor (2018)
  • Super Star Academy (2016)


  • The Bravest (2019)
  • Monster Hunt 2 (2018)


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