I Transmigrated, and Now I’m a Trainee?

A college girl accidentally transmigrates into the body of a male trainee ten years younger than her and gets bound to an unreliable System. Secretly contacting people? Slacking off? How can she turn this disastrous start around??? [Some ensemble cast elements. There are real-life inspirations, but it's not all that true to life, and some details differ. The goal is for everyone to debut.]