The MerKing’s Forbidden Queen

In my past life, I raised a broken-tailed merman into a king with my heart's blood, only to have him drain me dry to save my sister. Reborn at the auction, I reject him and choose another merman instead. This time, I train a loyal new king, expose my sister's schemes, and make the betrayer drink fake blood until he crumbles. Revenge and true love—both finally mine.