One fantastic drama that I will always go back to, and suggest to any kdrama fan

I LOVED this drama, its well written and thought out. It feels real, it shows real life crime issues and depicts real stories that happen all around the world.
The music is amazing and used effectively, it adds to the emotion of the scene its used in. I love so many of the songs in this drama and I'm still searching for one of the songs used ( I don't think its a fully released song sadly )
The cast was also really great, I liked the actors they chose because they aren't SUPER well known ( Like Suzy or Lee Minho, Kang Bin ect.) ( I'm not bashing the actors either! Kwang Soo is one of my favourite actors/entertainer.) It added to the story making them seem like real people"
Overall a fantastic drama and one of my favourites.
( Would also recommend watching Voice, When a snail falls in love, Guardians/ Lookout, and medical examiner dr.Qin for similar feeling dramas)