other readers' theory is that chanhee surpassed mujin (muyoung's brother) in ranks that's why mujin threatened or blackmailed chanhee to drop out. since the guy mentioned chanhee's overprotectiveness of wonhoo, what if it was wonhoo who surpassed mujin as number 1? so mujin tried to harm/threaten wonhoo but chanhee protected wonhoo. so mujin ended up fighting wonhoo which caused him to dropout? just a guess.
other readers' theory is that chanhee surpassed mujin (muyoung's brother) in ranks that's why mujin threatened or blackmailed chanhee to drop out. since the guy mentioned chanhee's overprotectiveness of wonhoo, what if it was wonhoo who surpassed mujin as number 1? so mujin tried to harm/threaten wonhoo but chanhee protected wonhoo. so mujin ended up fighting wonhoo which caused him to dropout? just a guess.