What started as a drama that looked like it was going to provide us with a fresh take on love and life in your 30's, with a stigmatized romance, quickly turned into a convoluted mess of tropes that have been done hundreds of times, and this show didn't follow them well.
The characters were great...at the start. They were grown-ups but showed us they hadn't figured everything out yet and that's where we were supposed to see them find themselves. Only they didn't until the last episode where everything was shove into a rushed ending.
I feel bad Victoria Song is getting such backlash, she didn't write the character, she acted well, it's just a shame her character went from naive to just plain stupid.
As for the other characters, they seemed interesting, or they would have been, had we seen more of them. By the end, we have their endings plattered up for us and we're supposed to care? I wanted to delve into the different romances, but it was 2 minutes on them and then the rest of the show watching the leads play tug or war with their relationship, though you could hardly call it a relationship, since it seemed such a fleeting aspect of the show.
All in all, if you like slow stories with rushed endings, go for your life. I got to the end by skipping 35 minutes of every 40 minute episode. Good luck