Rebirth of the Demon Lord: System Sign-In for Five Thousand Years

I just wrote it for fun, as long as you find it interesting. In 996, Fang Xiao, a migrant worker, died suddenly and traveled through the world of cultivation. After struggling for five thousand years, he became a terrifying demon king. He was hunted to death for seizing the treasures of the Taixuan Secret Realm. After his second rebirth, Fang Xiao opened the sign-in system and signed in for five thousand years in one breath. He resumed the path of cultivation. However, the sudden appearance of his marriage partner and the strange loli he picked up gave the former demon king some headaches... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.