I'm Only 17 Years Old, and You Think I'm the Core of Manchester United's Team Building?

[Team building core system (activated)] [The Red Devils, Manchester United, founded in 1878, have fallen into a trough. You are a super genius who grew up in Carrington. You shoulder the important task of reviving Manchester United. You will unite the locker room with your iron will and leadership vision, inspire the talents and passion of your teammates, clear out the insiders, lead the team to unite, and use the championship as a roadmap to rebuild the Red Devils...] [Task 1: Complete Manchester United first team debut] [Task 2: Win the recognition of the insider teammates with outstanding performance, and initially establish the status of "the core of the team"] …… Li Lang, who had just traveled through time, felt that the system mission was outrageous. He couldn't play football and inherited none of his skills or physical attributes from his original owner. Compared with leading the Red Devils to a revival, the probability of retiring on the first appearance may be greater. As for the "ghost teammate" described in the mission, what is this?