Because the director is busy with other work. Black Fox was filmed for 10 months, and all the cast members ran away. Photography, lighting, overall planning, producers have all changed, directors have changed four, and only Ruoyun Zhang lived to the end. Black Fox is an anti-war drama, directed by Zhang Jian, Tao Qiupu, Du Fu and starring Ruoyun Zhang, Li Man,,,, and so on.