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So the story takes place in a korean historical time. The uke is an assassin and the seme is some sort of noble I think. And they got along well(?). But one night the seme accidentally killed the uke. Then they got reincarnated to the modern time as office worker I think?
Is it this one?
http://www.mangago.me/read-manga/keeper_of_the_pearl/
ch 17 WHEN HE SAID MEOW. i already know he will but when its really happening i cant even (╯°Д °)╯╧╧ ╥﹏╥ MY KOKORO AAAA