[Updated] Wanted to like this one but lost interest halfway through. The reasons:

1) The acting's great, the leads are good together and the mom group is interesting, but
2) The side stories are forced and formulaic filler with zero character development
3) There's a bit of over-acting
4) Too many annoying flashbacks
5) Typical character setup: overbearing mom/pliant dad; ML is sure, successful and has annoying assistant/FL is lost, searching and has bubbly side friend
6) Typical kdrama plot habit: they start off light, airy and funny and then halfway through the "dark and tragic past" backstory kicks in and they get all dark and depressing
7) [Update] Gave it another couple episodes and saw yet another annoying trope: hiding their relationship from everyone for no justifiable reason.

I was forcing myself to watch by episode nine and once I hit that point it's just work and not a fun watch. YMMV.