As he moves, he runs, his look feels very innocent. He doesn't look his age at all. I think he plays the role perfectly. A younger guy might not be able to act that well in that role.
And I don't know what happens with the style of the female leader in korean dramas. But that's how nuns dress in Europe. Knee-length skirt, flat shoes with socks and a wide sweater... Hahaha
I did not like the ending. I don't see the point in introducing such a sinister character that wasn't related…
And one more thing that I didn´t like was the fact that they speak of the curse as if it wasn´t important at all. "Well, I'm totally cured, Ah very good" Meh. The story of their past it is very weak...
What a mess for nothing.