My Older Sister is the Protagonist

“I know these words may come as a sudden shock.” …What is he trying to say? “I have fallen for your soul.” …Excuse me? The one standing before me should definitely be the psycho male lead of a bleak confinement novel. Then who on earth is this man, kneeling modestly and smiling shyly? *After reincarnating, I discovered that my older sister was the protagonist destined to be imprisoned. My poor sister…! “It can’t be helped! Since things have turned out this way, I shall take my sister’s place.” I confidently intended to change the original plot, but…? “I know of a ring that would suit this finger perfectly; may I gift it to you?” “I refuse.” Some flirting, obsessive man is wagging...