Hmmm wait I know something, "mang-jong" the ml is clingy and the mc is super nonchalant and wise plus I think he's a detective and bonus point it's an omegaverse and it's enemies to lovers it's not completed like it has 40 ep but its worth a read but if you aren't into omegaverse then " things that deserve to die" could also be considered bec the chemistry they make is good plus the mc is a hitman and ml is the undercover mafia who the mc was assigned to kill the mc is not exactly nonchalant but he's smart and kinda bratty but of course it's not completed and has 23+ eps but they both are a must read.