THIS DRAMA DOES NOT DESERVE TO BE COMPARED FATHER IS STRANGE

My Review contains spoilers

I want to start of nice and say the character introduction was done so well. In fact I would say the first quarter of the drama was soo good I looked forward to it each weekend.

Then they ruined it, either they ran out of their creative juices or the switched writers or the first part of the story was stolen from a different writer before it was finished. I have tried to come up with so many reasons why a perfectly good drama was ruined.

I am completely fine with the male lead giving the female lead her space to grow professionally and emotionally that part is fine. HOWEVER there are SOOO many plot holes.

The relationship between the 2 youngest siblings was such a disappointment. The Cinderella youngest daughter's character deserved a better story line than she was given.
Woo Hyun Deserved a stronger characterization that he was given. In this drama he is basically just a crush boy and a good friend. His own character has no depth.

I also have many questions

Who was the man that rich mom was seeing? where did he end up with his life?
Where does the relationship with DK and grandpa stand at the end?
Does poor mom remain financially dependent on her kids?
Why were we introduced to their home sharing roommates if there was no story to tell?
How did Jisoo come to forgive her rich family after all they did to her poor Dad? Why did we never get that confrontation?