Utterly disappointed,,,,, the only good thing about this drama is it's story and that's what made me watch it until ep25 , but at this point FL has annoyed me to the point that I don't even want to watch her on screen, and it's not only about the actress (as I've seen her other works and she did a better job in them) but much more about her character, I just find her character to be too dumb and stupid. And the romance of main couple don't even mention that, it had me questioned that does FL even likes ML or not ...
FL's best friend whom she saved is probably her brother in law's wife, the one her mother in law tried to kill…
It has already been revealed in the drama that he's not her biological child. There was a scene when ML went to her in-law's house and FL ran away from there when she saw ML, and her son told his grandmother that she went back fue to nosebleed, and mistakenly confessed about not studying after dinner due to nosebleed. After that Grandma went to FL (her DIL) and during that conversation it was revealed that the child wasn't her biological child.
K-Drama 
1 
There was a scene when ML went to her in-law's house and FL ran away from there when she saw ML, and her son told his grandmother that she went back fue to nosebleed, and mistakenly confessed about not studying after dinner due to nosebleed.
After that Grandma went to FL (her DIL) and during that conversation it was revealed that the child wasn't her biological child.