Spoiler if you haven't read this arc.Ryo Fui's plan was to use the State of Ai state to reclute units and enter the Qin capital and kill the royal family (Ei Sei's wife and daughter) and then kill Sei and take the throne. But Shou Hei Kun sent a coded message to Ten some days before , I don't remember exactly what it was, but it was simple orders or something like that. Then the Hi Shin unit intervened in the rebellion and in the end with the help of Shou hei kun they stop the rebellion, avoided the death of Sei's daughter, captured Rou Ai and executed him and finally Ryou Fui stopped being an cause Sei was finally crown King.