Hmm im excited to see the upcoming chapters, the MC have mixed a number of martial arts together before so I'm hoping if he can do the same for that sinister art and use it as a final option or something
I remembered the MC is a kind loner and his parents hate him. One day he died and his soul was wandering around until he was found by "soul guiders". They were surprised that they didn't found out that he had died for a few days long already and he was brought to meet a person to do something...
People saying this is garbage / bad ? Bah ! I've read a wayyy worse reading material and I can confidently say that this is still good or decent manga. Go read a manga called "I was Trash" and open your pitiful eyes.