I thought it would be confusing based on viewer comments. It isn't. Ren is Zion Talic. I'm not sure how he will be deceiving Lord Kaim. Unless he has already, by being the Empire's dog and demolishing the 3rd King's empire. So that that Lord Kaim no longer had a place to return to. But he did that to save the 3rd Prince from being executed. The third prince being Lord Kaim, who has been held as a hostage.
Who's The Liar