After Rebirth, My Hushand Is the Sea God

Elena was stabbed to death by her sister Cora at her coronation, and she wakes up again on the day she once saved a prince. This time she walks past him and spends everything she has to buy a merman who is about to be sacrificed. He is Poseidon, Lord of the Seven Seas, with his powers sealed. Her family disowns her for it and Cora takes the prince. Cora and Arthur humiliate her. Poseidon is taken with her nerve, and at the Sea God Festival he reveals his strength and carries her off, which turns Arthur and Cora against her further. Rhea sets Elena three trials, Thetis lays traps inside them, and a rebellion breaks out in Atlantis.