O Stalker Curioso (2021)

They are similar because Cafe Midnight is the first Season of Cafe Midnight Season 3: The Curious Stalker

One of the main leads in Dear M (Jaehyun) is from the same music group - NCT as Doyoung who is a main lead of Cafe Midnight.

the male leads of both the drama are idols- both of them from SM's boy group NCT.
both are web dramas for a short binge.
little cliche but overall good.
highly recommended if you're a NCTzen or want to become one!