From a Slave to a Strong gale

Why...why!whyyyy!the f**k did my life have to be like this..., just wait you bastards I will make you guys live in hell ,wait ... just wait!!!! MC who got kidnapped by a Assasin Sect "Blood Phantom" and trained for 8 whole years in most extreme conditions that even the most powerful people will die but MC was determined and the first thing he did after getting strong was ..... If you want to know what happened , read it to know