tbh it's still not clear that this is truly the future. at least for me, i still didn't believe it at first. the reasoning why they thought it was the future wasn't explained, there are still other possibilities (such as item to show hidden desire, or item to show desire other has towards you, or just common illusion to bewilder you).
so actually the real spoiler is the note at the end which said it is from the "side story", that note is really not necessary. even if this part is written in side story, it wasn't written as part of main story like this, so it's more of adaptation... so no matter what technically it's not accurate to say it's taken from side story... that is the true spoiler.
Riiight thats what I wanna say too. Since they still develop their feelings at this time (and they still don't even realize their feelings), so this scene is like forced them to realize it. And I also curious too how the next story will be with this information on their head, since in the novel the progress is really slow but it's also make sense, considering they both a pro hunter and focus on their job than other things. But with this 'future' planting on their head, it's just feels weird if they never thinking about that ever again
I love romance but they definitely rushed it in this one (so unexpectedly too). Good thing they both seem to focus more on the severity of the dungeon situation (manhwa), but the reveal really spoiled too much of the build up TT. It would've been better to add romance during their preparation arc since they stick together a lot during that time
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It's like basically confirm that mc will still be alive even after the great dungeon so it's not will be a surprise anymore at the end... And tbh how in the novel the sex scene is dragging because of some situation and when in the end they finally do it, makes it much more interesting. Though I understand this is necessary to appeal some reader