There is a reason this is tagged abusive male lead. So know that before you watch it.
Overall, I thought it was great. It was short, so there is not much of a long term plot, but for people who love angst and drama, this is a great drama to watch. I have watched it three times. I adore angst and the way you get pulled in and feel all the pain too, and this show has plenty of it. The ML is also a great actor; his character is believable. Some people might criticize the FL because her character is weak, but that is still GOOD acting; she isn't like that in real life. She is realistically acting a battered wife type character. So I think she is equally good as the ML, just that audiences look down on character's that are weak and blame the actress when the character is supposed to be like based on how the writers wrote the story.
The kid actor was also cute, but he's a kid, so he won't be able to act very well, which should be expected at that age, and I would never deduct stars for that.
Some people can't stand slap kiss dramas and such because they can't suspend their sense of reality to watch a show, which is okay, and in which case, you shouldn't watch this; it'll be too much for you. If you can suspend it, try this drama out. You might like it, you might not, but you'll learn about yourself, what you like and what you can handle, and what to find or avoid in the future.