My Boyfriend’s Older Brother

He came seeking revenge, only to fall into a tender trap. She was devoted and true, yet ultimately lost her way. He let go of his hatred for her, but she could not forget her past for him. He is ice and fire; she is water and poison. He fends off every admirer for her, only for her to tell him, “I’m sorry, but by our relationship, I’m practically your sister-in-law!” “Is that so? Then just watch me make you my wife...”