The system is simple, you just need to try to earn his approval points always and everywhere and choose him whenever possible. But if you still don’t succeed, then I can prescribe my own path along which I came to this opportunity. I’ll say right away that I skipped the dialogues that did not affect the points, but indicated the answers that you need to click.
At the very beginning, choose him.
-admit and apologize
-give it ot red
-aproach red
-join red
-Help red
-calm red down
-dollow red
-join red
-go at the waiting room
-check the balcony
-check up on him
fight at colosseum
no metter what u choose
also after fight...dk i apologysed to him
after some chat rolle further and u will see
alright, good night red
and
tease him.