Isekai Blackrock Investment
The story follows the life of Lin Qi (Lynch in earlier translations) rose from poverty to the position of power. Our MC is a person with abundant life experiences and well defined life values. He relies on guile and financial expertise while skirting the law in the name of profit. He is for better or worse a perfect a con-man.
Blackstone Code took place on a parallel world of 1920s in a world bereft of magic. Industrialization was at its peaks, but consumption slowed down and the market saturated. Economic depression looms over the ~~United States~~ Federation. The bitter taste of war still lingers within the public consciousness. Here, a perfect agent of chaos - Lin Qi - transmigrated.
The novel surprisingly took a different approach from the other "economical genius." Lin Qi does not grow money through inheritance or sheer luck. He took note of business around him, learn their bottleneck, and provide them with the solutions. He had multiple conflicts with other characters that risk his "business" go under but managed to liquidate the problems through legal means. He is - by his own word - a good law abiding citizen.