Heartbreak: Tears of the Mermaid

In their previous lives, the Crown Prince of the Divine Clan, the King of the Demon Realm, and the Fox Clan's spirit maiden went to the Netherworld to investigate the matter of Mount Buzhou, then vanished without a trace. Later, the three clans slaughtered the entire clan of flowers on the other shore in the Netherworld. A thousand years later, the Crown Prince of the Celestial Realm returned with three others. At the same time, the merfolk of the lower realm were wiped out, and no one knew why.