mrlyn

Anthony became increasingly invincible after the death of his lover. He became so strong and incomparable that even though he was the second son of the previous king, but Anthony had been predicted that he would become the next king in the kingdom of Etona, which made Alexander feel unacceptable.


...

"We were born to hurt each other and this is how I love you."
...
Anthony didn't know what pain was before he knew Airin. He is a vampire nobleman whose strength is far greater than the normal vampire without knowing that falling in love will make him very weak and in pain. 
They love each other, but Airin refuses to marry Anthony because she is the incarnation of the goddess of the moon, the one who would become the greatest Witch who could not unite with a vampire, or one of them would lose his power. 
Until one night when the lunar eclipse occurred where all the power of the vampire and the witch disappeared, Alexander, who was none other than Anthony's brother, who always felt that his position as the crown prince was threatened by the power of his younger brother made him decide to kill Airin, he believes that Airin is Anthony's weakness but what happened after Airin's death, Anthony became stronger and invincible because of his anger over Airin's death.
Alexander feels increasingly threatened, he is also afraid that Anthony will kill him if Anthony finds out that he was the one who killed Airin. So Alexander decided to work with a Witch of the highest level to bring Airin's reincarnation from the future and make it a tool to eliminate Anthony.
Can Anthony make Airin remember him again and love him again, or will Airin continue to be instigated by Alexander and eventually eliminate Anthony?

***
Hello I'm Mrlyn
English is not my mother language but I try to write the best.
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Demon Heart: Trying to break the fate

Airin immediately moved away when she accidentally kissed Anthony's cheek, but the sound of footsteps made Anthony pull her closer and brought her into his room.

"Wait here," Anthony said before leaving his room, he closed the door to his room and left Airin alone.

"But..." Airin had not had time to protest but Anthony had already left so she could only surrender and wait.

From behind the door, Airin heard a voice and decided to eavesdrop.

"We want to clean your room prince as well as prepare water for you to bathe."

Lost