Douluo Dalu: Twin Children of the Nether River, Shaking the World and Shattering the Sky

[During the Douluo II era] [Female lead] [Almost invincible] A young man from the 24th century is reincarnated in a single instant. He is reborn as Huo Gua, though not quite as expected, becoming Xiadie, the daughter of the Underworld River. As a girl in a parallel world of Douluo Dalu, she possesses the Death Dragon, Poluxes, and awakens a System in that same year. A sea of flowers connects to the underworld, the realm of death and reincarnation. But outsiders shatter the peace of this sanctuary. The intruder is Tang San, reborn and seated high above in the Divine Realm. Since you have set foot here with murderous intent, you shall sleep here forever. The daughter of the underworld will gently send you home. (This book has several reincarnated characters: Tang San of the Divine Realm, Bibi Dong, Wang Qiu'er, Wang Dong'er, Juzi, and the God of Destruction.)