In her past life, Elara sacrificed her heart’s essence to turn the broken merman Silas into a Siren King, only for him to murder her and their unborn child for her sister, Seraphina. Reborn at the auction where it all began, Elara refuses to be a stepping stone. She leaves the ungrateful Silas to rot and chooses Kaelen—a stone-faced merman with unbroken pride. While feeding Silas fake "medicine" made of chicken blood to fuel his downfall, she trains Kaelen to be the true King. This time, Elara will rule the seas, and those who betrayed her will drown in regret.