Help me find this title

I need help finding this full color yaoi manga cause I’m going insane. So it went viral around last year. The mc gets transmigrated into a story I cant remember what type of media it was exactly(show, book, game). So he gets transmigrated into a character who is secretly an omega because he has an alpha boss. The boss tells him to send a gift to some guy he’s interested in and if the guy doesn't accept it then the mc can keep it. Mc does this and the guy doesn’t accept it which is like the obvious outcome to the mc for some reason so I’m guessing his boss’ gifts always get rejected and the mc who is like his secretary/ right hand man gets to keep them. The gift was a really expensive watch. The next panels that were shown when it went viral was of the mc in the shower fully clothed trying to control his pheromones/ heat and the alpha boss ofc walks in and looks down at the omega mc and is like “heh so wtf is this” in a typical macho alpha man teasing way. I read “ Secretary Gwanggong's Survival Diary”, which was a dumpster fire read but had a very similar premise which made me want to check how far along the story has gone but I cannot find it. Also from what I remember the transmigrated omega mc has black hair.