Comment by Kim Rok Soo on The Villainess Is A Marionette - Chapter 14

@Kim Rok Soo because he poisoned kayena..?

@vvvvvx1 But this happened when they were grown up. The emperor treated him like that since he was a child.

@Kim Rok Soo because 
he's the result of the empress, his wife, cheating on him. Also he's a legitimate child, the emperor like he said so himself, can kick him out whenever he wants

@sunny  I know, but I want to point out that if the emperor wasn't so mean to him since he was little, maybe Rezef wouldn't be like this either.

@sunny  I know, but I want to point out that if the emperor wasn't so mean to him since he was little, maybe Rezef wouldn't be like this either.

@Kim Rok Soo likely because of his short temper and incompetence. Having a extremely short temper as shown in this chapter with the maid can lead to the downfall of the kingdom. Not to mention he's a sad***, narcissist, he's stubborn, ignorant, immature, stupid, and over all not fit for the position of empero