First off the grandma is an evil cartoony villain and most of the supporting characters are just her henchmen catering to her every whim.

I have only gotten to the 15th episode while skipping through the last 4. Dropping this show because its just too damn frustrating, the grandma wanting to keep her promise of marriage from more than 20 years ago to a guy she met for like one hour is already bad, but her schemes and faking cancer to get them married is just evil. The show portrays her as kinda silly and lovable? but she is EVIL.
The female lead started out ok, she had a bit of spunk and was strong willed, not budging on selling her childhood home, and then she turned into a rag for the whims of the family and plot. She was trying to be a lawyer, but failed the bar exam 5 times cause she missed it for numerous reasons, then like a slap in the face to the viewer she gets pregnant (the pregnancy is fine) and in the last episode she misses the exam again by going into labour infront of the exam building (i just skimmed through the last episode).
The male lead was honestly whatever for me, kinda typical rich kid exec in a soap trying to make his family happy.
The other characters are kinda annoying too, though the ML sister started out ok, she became part of the cancer scheme, so she get lost.
Honestly, its probably like 4, but the granma and the last episode bring it down to 1.5.