VNET [21Vianet] SC 13G/A: Joint Filing Agreement [Remainder of this page has
[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Sheng Chen Sheng Chen Fast Horse Technology Limited Sheng Chen Director Sunrise Corporate Holding Ltd. Sheng Chen] [1 Name Of Reporting Person Sheng Chen 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a) 3 SEC Use Only 4 Citizenship or Place of Organization The Peoples Republic of China Number of Shares Beneficially Owned by Each]