(I did not read the novel)
I watched the tv series(love O2O) first big mistake.
Because now I feel like everything was really rushed when in reality it was not.
I already knew all the characters and the plot, so for me there wasn't anything interesting really.
I'm not sure if I should say watch the movie or drama first I would recommend watching the movie first and then the drama because in the drama they explain way more so if you didn't understand anything in the movie you could always watch the drama.
Or only watch one of them it helps you not compare the two.
(sorry if I made any grammar mistakes)