After weeks of filtering every possible tags and flipping more than hundreds of page I finally found this manga again.
I read this manga years ago, really like the story and psychological aspect of it, the segs stuff is just a bonus for me. Somehow one day I just remember this manga out of nowhere and have the urge to re read it. Problem is I don't remember the title and I didn't have an account at that time so I didn't bookmark it either. I considered to just ask it online since I remember most of the story in it, but knowing what kind of manga is this I'm afraid people will judge me. Overall, I'm glad to have found this manga again.