Mist! It just finished recently. It goes deep into time travel and time paradox theory though, so it's the kind of novel that makes your brain think. MC and ML interactions are quite funny to see, and they have that tacit understanding that the MCs and MLs in GUEE and TEIO share.
I saw this comment and was so thrilled--the novel is amazing and really needs more attention! Global University Entrance Exam I have a list with a decent amount of good-quality thriller BL novels with actual plot and complex thinking. Not sure if all the novels are what you are looking for, but most of them have similar themes involved: https://www.novelupdates.com/viewlist/36834/ Sorry I would type them, but I'm only taking a short break from my work right now TT.