The World Child's Redemption [Quick Transmigration]

An Xu had been in a sealed space for as long as he could remember. The space was sometimes pitch-black and sometimes completely white, and An Xu had never been able to leave. Then one day, a mechanical voice rang in his ears. "Scan complete. System activated." The sudden voice told him, "To leave, you must complete the tasks I assign." If An Xu could complete the tasks perfectly, he would be able to get out. He firmly believed that once he left this space, he would remember who he was. Following the tasks given by the System, An Xu helped the Child of the World in each world and guided them to achieve their objectives. PS: The protagonist is the bottom.