System Headquarters No. 003 selected the recently deceased soul Lin Ye for binding in order to make a bid for a supervisor position. This is a crucial mission on its path to promotion, and Lin Ye's condition for being resurrected is to complete the work assigned by the System.
Since the Chosen Ones in each world are all subject to an evaluation period, they must receive their golden finger in a way that fits their circumstances, and the mission-taker must protect them from harm as their guardian.
Once the Chosen One has fully grown, they must leave the world in a reasonable manner.