Reborn, I Went from Fan to Hater [Mecha]

Sui Mingyue's former idol had a problem with his attitude. He'd lost his dreams and was training halfheartedly, turning into a couch potato. Sui Mingyue wasn't good at persuading people with words. She made up her mind: she would hammer his thinking back onto the right track. This is the story of a fierce young woman who takes a System that's useless at everything in the early stages and grows into the Queen of Mecha. Theme: Slacking off in training means there's a problem with your attitude