Responses
This one maybe? I may be wrong tho...
http://www.mangago.zone/read-manga/volcanic_age/
Thank you so much! I finally found it haha
Haha np.
The mc knows what will happen in the future. I think he came back in time and tried to get as much power as possible in terms of wealth and army. I remember him finding assasins/slaves and becoming their master. He also has the support of the leading merchant company so he can mass produce products that other forces are seeking