I don't think there's going to be much of a redemption arc yeah he'll soften towards mc but I don't think there will be begging or groveling or deep regret.
Like his mother explained to him, when she got with his father he resented that his well-being was all up to her and he's still "paying for his sins from back then that's why he's under my thumb "
So like father like son.

Also i hope mc will hv the choice to be or not to be his rainwater. Like if ur life depends on him atlst treat him right and stop acting like hes disposable tf