I Became a Demon After They Betrayed Me

The Shen family has guarded the spring where ten thousand demons are sealed for as many generations as anyone can count, and Shen Changyan is the last of them. The demon body he was born with is held down by a red hair tie, and holding it down is his whole life. The villagers of Cao Village wanted what the seal was keeping, and they tore the tie apart to get it. The power came out. By the time it was finished the village was gone and the people who had spent years being protected understood what they had done, briefly. His grandfather is missing, so Changyan walks into the Demon Suppression Bureau's water prison on purpose to look for him. There he frees Qingci, a nine-tailed fox whose family the Shens once helped, and gets pulled into a fight over a treasure called the Jade Cicada. The Bureau's own director triggers a demon tide that kills hundreds to serve himself, and Changyan uses soul-searching on the dead to trace it back. The person standing behind all of it is the senior disciple he respected most.