Living with a sick mother is not an easy thing for you, you are the only daughter who has to take care of her. So when your mother gone, you felt like your world was destroyed. From then on you have to fight alone, take care of your own life and everything. None of that means anything if you're just alone and lonely.
But luckily your ups and downs at least didn't kill you, because Younghoon was there, accompanying you as a very good boyfriend. Younghoon loved you until you felt like you weren't the scum of the world anymore, you were his hope. The only thing he needed to fight for. Everything about you, Younghoon loves it.
Unfortunately your love with him is not that beautiful, because it is clear that his parents reject you outright. You are a girl with unclear background, who had to leave his home after being kicked out by his parents. Younghoon ran after you, saying apologies over and over again and begging you not to leave.
"I'm sorry for how my parents treated you... please don't listen to them. Because I won't leave you..." Younghoon begged, but you were already hurt. Should you stay in this relationship with him or just leave him and end it all?