Huh? There is so much wrong in here.
Yes, there is very high possibility, that one of them will end up dead in the end, especially if the seme will become the yakuza leader. Seriously, just the fact that uke is a cop and seme is yakuza, doesn't mean their love won't last long. Both are very dangerous "works" but jesus man, this is yaoi. This is nothing like reality buddy. It's supposed to be hot for fangirls/fanboys and now, don't tell me secret realitionship, between cop and yakuza isn't hot? It's forbidden fruit and that's why it's so exciting. There's no way, you should go with logic here. It's supposed to be entertainment for those, who enjoy reading yaoi. I really do enjoy those logical comments, but sometimes, you should think about the fact, yaoi isn't supposed to be like reality is.
I can only assume/hope you've given up on this genre because this is the 3rd or 4th "reality" based bitching comment I've seen from you. This is fiction that you're reading here. If it's too much for you to handle, save yourself the stress and read another genre or type of story. May I suggest fact-based historical novels, reference texts or maybe autobiographies - since you can't seem to relate to fiction. Your complaints would be valid if they weren't so blatantly about your own inablity to read, relate to and enjoy fiction. You make it seem as though there is an issue with the story itself, when in fact, you are the problem. Give yourself a break and read something else.
This started to fast, drawn out to slow and easy to figure out, and in the end really, really stupid.
Our Uke the cop wanted nothing to do with the seme, then he's suddenly after being rescued by the seme who then goes on to nearly rape him the uke is suddenly in love? WTF?!
Then at karaoke the seme says that he isn't seeing any other girls cause he wasn't actually dating any of them and was serious with the uke, only to appear to the uke after they parted that day to tell him that he dumped all the other girls for the uke. HE JUST FUCKING ADMITTED TO LYING TO THE UKE ABOUT BEING WITH ANY OTHER WOMEN AND THE UKE ACCEPTS THIS?!
I'm sorry but if my passion was being a cop there is no way that I would ever stay with the seme! I don't care if I somehow "Love" him, I'll have to go through the pain but if you are constantly having to question your partners Trust means that this is not a healthy relationship! It's sick and stupid. This relationship isn't going to last. Either the seme will have to leave the Yakuza or the uke will have to quiet being a cop, that's the only way these two could ever be together. If not then in the end their going to be in loveless marriages and one of them may very well end up dead. That's it. Good manga but it did also suck.