As far as Family oriented romantic comedies go, making use of experienced actor is always a good plan, since very few plot elements and conflicts will be new. It's a genre due to the nature of story telling will have very little room for creativity. The introductory setup was done decently, riding off the talent of the experienced actors and they dispensed of the back story as quick as they could.

There are signs of concerns as well. Is this a 50 episode romantic comedy story, or is it a 50 episode family drama? The material of the conflict does not seem like enough for 50 episodes certain mysteries tend to be quite annoying if they are dragged. Long drama need talented actors, and hinge alot on the characters.

The prelude was meh, the set up much better. So the show is on a precipice. If the comedy quality goes up, and they temper the incredulous this might be another "Father is strange" or "What happened to my family" shows that benefited greatly by leveraging on the ensemble cast.

The characters aren't exceptional but the actors experience covers for it... So far.
The plot isn't that ground breaking, but good writers know how to work around that... so far.
The Setting is pretty much standard for the genre.

It's just getting started, and it has started well. Now it's up to the writers and actors to keep or raise the standard so that it doesn't become a slog.