I thought the premise and the acting was pretty good. The "whodunnit" was well guarded.
Complaints
1) the cinematography is that of a 2000s kdrama
2) I want the sound director/editor arrested for not knowing how to transition music between scenes.
3) The drama director can go too for having the male actor cry like a goofball during what should have been really touching scenes. Dramatic lines delivered as comedy was super cringe.
4) The last episode... I get why Naoki wanted the cop around, but why in heck was Yui not trying to spend every last single moment ALONE with Naoki instead of all that other jive.
5) The big reveal SCENE took too long to play out. It was painfully and obviously drawn out. The audience knew, the characters knew, but spending almost a whole episode in one spot just to hear some words... Could've been better.
What I did like was the Yui was not a weak, timid, adultchild which I've seen in the few J Dramas ive watched. It was refreshing and I hope to see more female characters that don't just exist serve a man in a show.