yeppp this one is really obvious!! let me list the signs that, ALL TOGETHER, make me think that way (since individual things and quirks can be read as the author's writing style)... starting out with the summary you have em dashes with spaces outside of them. im not one to go after em dashes as an instant sign of ai because i personally love them and i know a lot of people use them but it's just that in conjunction with all these other things i would take it to be a sign!! next is the usage of the word "unspoken" (kind of genre of word seems to be used in ai generated stuff, along with "unnamed", "unnameable", "undeniable", and especially "unreadable"). then ​​"[statement a]? [statement a], _..." as a kind of emphasis on something (seen in the summary as "and sungho? [...]"). and all of that is only in the summary... in the body of the fic, there's more notably the fact that almost everything is in like.... one line... like one sentence per line..... which Is something ive noticed in other ai stuff. oh shit i just started scrolling and noticed its LONG AF.... okay and ultimately the biggest confirming thing to me is the fact that it's clearly generated in chunks. i dont think ai can generate like entire massive 14k oneshots so it has to be broken up into "scenes" that are generated. then the author put breaks between each chunk. scrolling down to a random point in the fic and saw this pattern: “the kind of”/“the type of” followed by something that might not make a whole lot of sense. also the common usage of a certain phrase: "not just _, but _" or "not _, just __". cit an be switched around in various forms. also groups of threes. but yepppp this one is really really obvious
MOST obvious signs to me personally are the generating in chunks thing and the unspoken/undeniable/unreadable/unnamed/whatever thing...