I have been in depression for past 2 years. And i could relate with the characters more than any series/film I watched . It made me laught and slight helped me also . It may not be the best drama and in many areas it lacks . But, some dialogues or situation within a episode is so relatable it will make it worth watching .Do give it a try if you not looking for popular rom com type dramas.
I am glad with the way they are showing family politics rather than boring leads conversation . The divorce happened so quickly which was also very good. The scenese i didn't like in episode 8 was the aquarium and metro train. Now, it will get more interesting with all the comedy between the families which i cant wait to watch.
the pros and cons you listed out about acting , mystery , kissing skills are not what the drama is meant to be . The only thing i can agree is " I feel like the mental health aspect was demonstrated pretty well" . This maynot be the best drama in many aspects, but it is like something which is a right way of thinking on how to make kdrama content tackling issues like depression .
"What is better? Does it mean they'll become happy? " Ouf of many conversations . This one line also put forward what the series is all about . As expected , many are not able to see it.