I, Salamander, Was Abandoned by the School Beauty at the Beginning

This is an era where all people control beasts. When Yu Ziyu came to this era, he became a salamander, one of the three masters. Average qualifications? Poor talent? Don't panic, I have a 'self-discipline makes you stronger' system. ... I, Liu Qingrou, am the school beauty. I threw away a salamander that was pretty rubbish. But I never expected that when we meet again, he will have transformed into a red dragon, looking down at the world.