If you watch enough dramas, you will notice that there's a lot of romances with the themes of crime or with the setting around the justice system, and most of them have a strong dark or serious tone to it. Shows like "suspicious partner" are some of my favorites, managing to have a great romance and still deliver a great suspense. BUT this show, despite also having these themes, goes for a more comical or heartwarming approach.
. Great Romance, I felt like the characters really worked well together, it didn't fell forced, even if it has those "they stare at each other for 10 minutes as soon as they see each other" moments and it wasn't at all, depressing. They are in love and they build a strong relationship overtime and do their best to not let it crumble.
.Great performance, I wasn't expecting much and even tho there wasnt the need to deliver crazy heart wrenching scenes, but even the side characters have great chemistry. Also child actresses were phenomenal, that ghost kid almost made me cry.
.Strong OST too.