Ninety-Nine-Year-Old Man

The protagonist goes back to the 1980s and 1990s. In his previous life, his family was ruined and his wife was separated. After his rebirth, he took advantage of his "prophet" and started by setting up street stalls and reselling treasury bills to build a business empire step by step. At the same time, he severely slapped the best relatives who bullied him in his previous life.