If you read the novel, actually he wants to learn the mugong for his magic circuit not the martial arts. But i love the manwha development because they cuts all the unnecessary stuff from the novel and focus more on the important thing.
I would say 2 chapters of novel is equal to 1 chapter of manwha? Idk maybe 2 or 3? Or just 1 chapter for 1. Tbh the novel are quite boring to read. I wont recommend it for you to read, but if you want to, go check out wuxiaworld. The novel have nore explanation than the comic itself