Lucas, nicknamed "muscle," is serving a life term in prison for his involvement in the murder of Lucas's father. He's also nicknamed "doctor," because he's a doctor, and because he was convicted of leaking state secrets. The two guys in cell D1 are easy to fight, but they need to be wary of the leaders of the two gangs in the prison, the "black gang" and the "white gang," because they're the ones who'll be able to beat you if you try to mess with them. Lucas is furious, because he thinks that the two guys are trying to trick him into thinking that he beat the "number one fighter" of the gang, lucas, in the fight last night. He doesn't believe them, because the other guy, protea, is just a wimp.