Same. I actually watched the doungha 2 times, drama nearly 2 times, and read the novel. I didn't expect to get this hooked on this series. Same with heaven's official blessing. Now I am waiting for manga to end to not suffer from cliffhangers. (〜 ̄△ ̄)〜 Also I strongly recommend the novel. The novel is just different and then there is side storiesლ(´ڡ`ლ)
I am waiting for the manga to end before reading it. But from the comments, I saw I can tell you they are pretty similar, but the novel gives you a lot more insight into their feelings(obv). The starting parts are not that exciting so if I were you I would start from when things started going bad. Also, I don't know if the manga is like that but the novel's storytelling is a bit weird. I mean it goes to past and present continuously. I hope this was helpful for u:) someone (who finished the both)'s answer would be better tho(▰˘◡˘▰)

I am actually super hookep up with this series.
Found the anime out of curiosity watched the whole thing, now waiting for third season!
Currently, I am watching the drama and I just caught up with the manga. I would probably read the novel as well.
I never expected to like it that much, same thing happened to me with Heaven Official's Blessing.