A warm, dark, hot and sad slow burn

The plot is dark but so comforting at the same time. The cast transmit so perfect their chemistry, its so enjoyable to watch them <3, I love how she's not stupid like other protagonists that you just want to smack their faces and He's just the definition of 'I can fix him' but this time SHE REALLY FIXES HIM!!! ugh Gong Yoo you're so perfect that hurts... long story short, if you're into more mature and a little twisted kdrama it's *worth watching*

Ps. I really loved it... but why that ending? My anxiety can't take it