Is this worth reading?

I would say it’s definitely worth reading the plot is really good and realistic and each character is complex and morally grey, but Ilay (the ml) doesn’t really have a character development since he’s not meant to change or become a good person simply because he fell in love, but their bond is actually very deep and meaningful and their relationship eventually becomes healthier in the later novels

Ooh seems pretty nice to me

PASSION novel, which this manhwa is based on: i'd say there's some char development but it's not complete

You'll really feel the development, esp of ilay's character, in Diaphonic Symphonia (book 2) and Passion: Suite (book 3). But i doubt they will make a manhwa out of it.