Where's the side stories?

I forgot about this story did the author change their mind about side stories? I was honestly sad when I saw the MC ending I wanted him to win so badly and to rebuild his life and be happy but sadly he couldn't escape the sponsor clutches. If I had to choose for him to be with someone out that lineup it probably would've been the young Sadistic one he fought but I prefer he just be single and fine someone who is caring & nice. I hope in the side stories he gets save and can finally be happy.