I think for me I would most definitely rate it a 3 stars mostly because the story is good but the ending is terrible, the reason I have stated this is because though there are two male leads one of them is the villain of the story but has more of a back story which is Ryu-shio which definitely caught our hearts because of the fact that we know his back story and the reason why his doing what his doing and as for the police male lead his story is not introduced or really explained they just based it off him being a good guy and being a cop who is investigating the whole case but in a more professional opinion the cop male lead should have not gotten the better ending of the story.
Had it not consumed too much to the audience about the other male lead who is suppose to be the villain , having them lead the ending that way is a terrible way to do things but not just that specially when they are suppose to be a character we aren’t suppose to like.
They also had heavily consumed the other stories of the mother and grandmother which left little about the Female lead, in conclusion those are my professional opinions and I honestly wouldn’t recommend this series because of the way they consume too much of the side characters.