I haven’t read the novel or watched the drama so I’d appreciate if I got no spoilers. 

1: Is the novel similar to the drama and is it worth watching it? 

2: Where can I read the novel and how many chapters does it have? 

Thanks!

if we compare it to other dramas adapted from novels, then aol is actually quite faithful to the original novel. there were minor changes, but it doesn't change the storyline. 

you can read the novel at one second spring, it has 20+ chapters, pretty short for a c-novel :)