Um okay so what I do is I start by getting them use to having the other bunnies scent in their space. So if I where you, I'd probably take Ryo out of the room and let Charmin explore the room and get his scent in it. You can also exchange litter boxes, beds, toys, stuff like that every day to get them use to each others scent.
You could put Charmin in a cage or pen in Ryo's room but be careful because rabbits can still get into fights through the cage bars! I would suggest you not leave him where Ryo can get too - maybe put his cage up on a table or block it off with an xpen when you can't supervise. But being able to see and smell each other constantly will help with bonding.
After both their scents are in the room and they seem to be doing well with bonding, you should eventually be able to let them run around the room together. Only let them have supervised play time at first. I start off by keeping the time they are together short, then slowly increase it until they are together all the time when I'm home and only separated when I'm not around. Then eventually once I trust them together I'll let them stay together all the time.
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