I understand what they were trying to show when Akira slapped her in episode one but i think he should've shoved…
Throughout the series he says that he was immature and did not know how he felt about her. He just wanted her to seem to get close to him. He admitted being immature and such, showing a real maturation of the character.
I do not believe they're going to put such a terrible disease on our main character that way. Enough of suffering! I want everyone happy soon! This drama is the kind that makes you love to suffer <3
I watched the last episode that passed and the last sentence Eun tae tells his brother-in-law and his sister while holding EunSo in his arms: "This is my daughter."
https://www.youtube.com/watch?v=GLXFLrYjWxA