Short review this time.

~Strengths~
This drama is OK, in terms of plot, characters and acting, everything falls in line, however do not expect anything to see something you have not seen before. The best part of this drama is Lee Joon Gi, damn his acting can make anything boring look interesting, and he made this somewhat ok plot feel more interesting than expected. He does well with psychopathic-ish roles, and emotes so well with his eyes. The love for their family and commitment to each other is warming.

~Neutral~
The plot was ok - not very logical jumps, but there are times where things seem farfetched. Other actor's acting, and directing, structure was not bad.

~Weaknesses~
The plot was ok but also a bit weird. Baek Hee Sung's family situation was odd but you went with it, yet question "so, ok why would they do this?" Again the plot was ok and I would have dropped this if it wasnt for Lee Joon Gi.

TLDR: Good drama to watch for chilling out at home but not if you want something more.