City: Hand in the Fighter Blueprint at the Beginning

Lu Yu started out with a system of helping others. As long as he helped others, he would get points. Points can be exchanged for various items in the system: fighter blueprints, gravity-free engine blueprints, particle collider, dark matter... "Ding, you saved a child, and you will be rewarded with the B2 fighter blueprint." "Ding, you can use 1,000 points to exchange for 1 gram of dark matter." "Ding, you can use 100,000 points to redeem a giant particle collider." "Ding, you use 500,000 points to redeem the Iron Man suit..." … This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.