Eunhyuk still thinks Raim is his half sister and feels guilty that his father abondond her so he's trying to make up for it.Raim however, knows this isn't true but doesn't tell Eunhyuk otherwise because this is the only way she can keep Eun in her life. She knows that if he had to pick between suae and her he will always pick suae
Naurrr. Raim's mom never had an affair with Eunhyuk's dad. That's just what Eunhyuk thinks and thats why he's still looking after raim because he thought Raim's mom had an affair with his dad and had raim as their kid. He thinks raim is his half sister that his dad abandoned. However, raim knows they are not siblings. She knows that both her real parents are dead and that her real dad is a blond guy. her parents died tg and never cheated. But she is letting Eun believe that they are half siblings so Eun doesn't leave her. She's a messed up liar

I never understood raim’s role in this story?? Why was she living in suae house at the start? Is her mom the one eunhyuk’s dad was having an affair with?