There's Something Wrong with the System. Give Me the Immortal Cultivation System.

The protagonist Lin Fan's awakening system was originally thought to be the system of the richest man in the city, but it turned out that the system made an error and gave it to the system of cultivating immortals. The system releases immortality cultivation tasks every day, but there is no immortality cultivation in this world at all! Lin Fan was forced to use modern methods to complete his mission of cultivating immortality, and became prosperous in the city.