I don't know, but korean manhaw's are pretty heavy in portraying the dark themes especially the bullying in the beginning. Compared to Shijou Saikyou no Deshi Kenichi the Breaker is much heavier. If you liked this manga you'll probably like Feng Shen Ji.

Anyways, i think the story line is fanstastic i give it a 9/10 (but only for the first part up until The Breaker: New Waves). Though the death of Shiho was saddening it was understandable and very well done, her death also allows the reader to sympathise for Han as he turns to evil in New Waves.

The art is good i give it 9/10 because I personally like the art style, but usually art come down to interpretation so at worst i think its an 8.

Character development is good 8/10, Shi-Woon starts out a whimp then becomes brave and somewhat strong. Even the little romance between Sosul and Shi was alright.