{SPOILERS AHEAD] I completely understand where you're coming from. In The Breaker Si-Woo(Shin-Woo) is a total bitch who's too weak to back the ideals that he believes in. However in The Breaker: New Waves after losing his Qi center he starts taking a pill that's made from his blood that gives him his martial arts back temporarily. However as time passes on he begins to gain his martial arts abilities and his ability to feels and move his own Qi. I thought he was a total bitch when I first started reading, the only thing that kept me interested was the art but about a quarter of the way through New Waves he started to develop the power to back his ideals. If you enjoyed The Breaker I'd suggest giving New Waves a chance and reading it in its entirety because imo it is one of the greatest martial arts manhwa in recent history.