Ok i read this awhile ago but i still remember because it wasn't slightly implied but VERY CLEAR ACTIONS i may not remember it all but once of it was when he knew that the ml read his notebook then went and deliberately wrote something to make him feel anxious, and there was some line few chapters before the end of the novel about how they both hurt each other but still one can not live without the other ( smthn like that)
THIS?
"[Kwak Soohwan]
The owner’s name was written, as if there was a name tag on the book. The handwriting was amateurish, like that of a child. Flipping through the pages, he noticed the handwriting gradually becoming more refined. Turning a few more pages, something stuck between the pages caught his eye.
It was a discolored piece of paper stained with dark red.
[Alive]
Seokhwa stood frozen for a while, holding the open book."
or do you mean like when Major read his notes?
Huh what major notebook lol I'm talking about his little stalkery diary at that moment he wrote something that he knew would shake the ml and he didn't even mean it but just wrote it for that purpose , i read the one on redhife? It wasn't perfect either. Oh and I just remembered one of his monologue he goes " ml saved that cat because he found it pitiful so I'm gonna act like that so he can't kick me out " and he's honestly pitiful but i like how he grows more emotionally intelligent and read the the ml as open book and how he's crazy about him at the end
...could it be that...you got the wrong story? Σ(  ̄□ ̄||) Other than writing down his rebel ideas in binary code, I don't remember Dr.Seok ever owning a diary. (Unless someone else can confirm that this happened and I'm dumb and need to reread it again, wait let me message that other dude that ik read the novel as well. Sorry, it's not that I don't believe you, i just wish to increase my understanding of rainbow city more, thank you for sharing)
YOU'RE NOT READY BOTH ARE RED FLAGS and honestly it's the best thing about it i never found something like the novel