E Long Zhuan Sheng, Fu Chou Cong Wu Sui Kaishi!

The narrator was once a powerful red dragon, the top predator in the world, whose species was hunted and killed by humans over thousands of years. Driven by a desire for revenge, the dragon fought to avenge its kind but was ultimately defeated and killed during a final battle. After death, the narrator was reincarnated, but instead of returning as a dragon, it was reborn as a weak human child.