Help me find this

Ok I think in this story you have key to your chest which can unlock your memories or something not sure. The mc has feelings for his frnd but something happened and the mv was framed for the frnds mistake and he was sent to jail. I remember the seme's hair was red and long. And he had this black shadow like thing that covers him. He couldn't speak well at first, but he likes mc so much. And he is strong. The mc also has a frnd in the jail "his big brother" who will protect him. And last time I read there was this fight or something and the mc was paired against the champions (who is the lover of the frnd wink wink) and the mc was practicing how to dodge the attacks. Pls tell the name of this one.