To talk about why Silver Wolf said that, we have to go back to childhood—back to when his dad first brought Chu Molin home and told them this was going to be their big brother from now on.
At the time, Silver Wolf was immature and didn't want to treat him as an older brother; instead, he wanted to treat Molin as a younger brother. But Chu Molin wasn't having it—he rarely spoke and was ridiculously prideful, always walking around with a cold, expressionless face. Asking Silver Wolf to call this guy "big brother"? Of course, he was against it.
So, they ended up having a duel—it was simple: whoever won would get to be the big brother. Naturally, Chu Molin won. From that day forward, whenever they crossed paths, it would inevitably lead to a sparring match.
