Another great drama without too much and without the extra tropes thrown in. The main couple would break up but they got back together fairly quickly because they really cared about each other. The main reason they broke up was because he didn't really have a memory loss and only used it as an excuse to stay closer to her.
Also, I sorta knew who the real bad guy was almost from his first appearance. I just didn't know how much his mind was messed up. I also don't understand if the ml is the father's real son or is he adopted? I don't think that was fully explained after a comment from the older brother.