This is a very good drama to watch and very entertaining.
It starts off really well with the parents story that immediately hooks you in and then holds slight plot twists but some of them become predictable and some parts you can figure out before it's explicitly shown.
Acting wise, I think Choi Jin Hyuk's character was done the best. You almost fell in love with his character and started to pity him. Suzy and Seung gi did well too.
Story wise, for the most part they did a good job of wrapping things up, although there would be 1-2 things that I felt like they never explained clearly, but it's fine really.