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It's a yaoi manwha (i think) and all I remember is that MC and ML met in a cafe where the MC was undercover and ML is a mafia boss of some sort. MC then goes to Russia (I think, could be somewhere else) and kinda teams up with the ML and also the ML has this thing about rainy days. Any help is super appreciated. ٩(๑❛ᴗ❛๑)۶