Luckin Coffee has replaced co-founder and (now ex-) chairman Charles Zhengyao Lu, despite his efforts to maintain control over the troubled Beijing-based coffee chain. The company disclosed in an SEC filing on Monday that Jinyi Guo, another co-founder, board member and former acting chief executive of Luckin, has been appointed as its new chairman and chief executive officer. In today’s SEC filing, Luckin also said a total of four directors have left the board (Lu, David Hui Li, Erhai Liu and Sean Shao) and two new independent directors have been appointed.