Return to the Exciting Era of 1991

Good news, it's 1991 again. Bad news, I only have one dollar and thirty-five cents on me. No matter how ambitious Ren Yi is when he returns to this era, he has to face reality. As the old saying goes, it's impossible to work part-time. Ren Yi, who had no capital, could only find another way to save his first pot of gold. The first step in Ren Yi's grand business map is to sell "mines"!