Your grandmother died and you were the only one who took care of her so she inherited everything to you but you’ll only get the heritage if you get married. Sbd wants to prevent that and tries to kill you. Now you’re even closer as he’s very worried for you but also the chemistry between you two is just right. He is planning on proposing to you as you know each other for a long time now and this was just the right moment so you wouldn’t have to marry someone you barely know and he loves you