Kylo Ren turns light-side again and works to bring down Snoke... but afterwards, he still needs to face the Republic's justice for what he's done whilst working for the First Order.

Let's see Kylo/Ben dealing with waiting for his trial, interacting with Leia and Luke and the other Rebels, fighting the temptation to run for it or kill himself, and ultimately deciding/being convinced to stay and face the music. Nobody said redemption was going to be easy.