eh i dunno if the rock would be that generous, plus kihoon formed the question as " so will you choose to forget me? or shall i forget you my angel?".
if he said "should we forget each other or choose to retain all the memories" it'd be as you said. i don't think they'd choose to forget each-other if there wasn't any compromises to be made.
the rock is stingy and picky (i hope i don't come across as rude :(( my ENTJ personality has no malice i sweaaar) - 3 -
Rereading it, it seems like the rock was being really generous and kind in this specific chapter because it just wanted them to be happy. Hence the pass or fail being that they stay connected as partners OR all memories will be purged. I think the reason Kihoon went straight to that is because they both were in so much pain last time that he didn't think they could handle both remembering what happened in the past and didn't want the same fate. They both regretted knowing each other in their past lives and blamed themselves for how things happened, so it seems like Kihoon just felt like this was the only way they could be happy

FYM YES??? You literally could've said no. The rock gave y'all a choice right?? Am I missing something?
That fuck ass "couldn't refuse the angel" made me tweak