My Contract Wife Is Naturally Adorable

What century are we living in? And they're still arranging marriages? Even for the sake of the family, they can't ruin her whole life! What? You have your celebrity girlfriend, and I have my handsome senior boyfriend! You say I'm immature? I should be the one criticizing you for being an old bull nibbling on young grass! Since neither of us has feelings for the other, let's just treat this marriage as the year's biggest drama. We'll sign a prenuptial agreement: the marriage will last one year, and as soon as everyone's interests are balanced, we'll get divorced! Besides, this impossibly handsome, cold older brother gets along quite well with her. They can work together behind the scenes and stay on the same page. Even if they can't be husband and wife in the future, they can still be brother and sister. Let's cooperate and put on a good show, okay? That's what she thought. But, big brother, why are you acting stranger and stranger? You know I have a boyfriend, don't you? Why are you scowling when I say I'll bring him to meet you? Why are your eyes blazing when my boyfriend and I hug and cuddle? I get it. Your celebrity girlfriend has been too busy lately and neglecting you, so seeing us together makes you feel sad? Fine, I'll be considerate and won't rub it in.