HELPPPPP find this

So this is one is korean origin
The story start with him being transmigrated in another world as a test spécimen or a slave ..maybe ..? But like he was working hard and wzs sick
He knew this world and the character he possessed was weak
He escaped the facility but like he needed this substances
He started working and for the substance he will buy it from someone as a vape or cigarette
he a knew a place its a bar and a women give him the missions she was the one to introduce him to the guy that make this substance
He made a lot of money and name for himself