Its been years since I last read this so some things might be inaccurate but the MC(dark-haired) is a detective/cop and while he investigates a case he comes across the ML(light-haired) and they ended up hitting it off and sleeps together. They meet up a couple times after to drink and hang out. Eventually tho his coworkers points out that the ML seems sus and might be the suspect that they have been looking for. Fast-forward, iirc towards the end MC confronts the ML and he confesses to it in his car but then other cops arrive and they ended up in a gunpoint. Also idk if this helps but the colors were very neutral (typical noir vibes) or it might be straight-up black and white. Please help me look for this manhwa.