https://www.mangago.me/read-manga/the_third_decade_dindin/
https://www.mangago.me/read-manga/love_sick_dog/
https://www.mangago.me/read-manga/diss_love/
wouldn't say these are all entirely realistic, but they're mostly grounded and there aren't huge or ridiculous physical disparities between the couples.
These r some of my faves ٩(๑❛ᴗ❛๑)۶
https://www.mangago.me/read-manga/walk_on_water/
https://www.mangago.me/read-manga/aporia/
https://www.mangago.me/read-manga/green_apple_paradise/

I'm looking for recent webtoons no Buffy, no cute and girly MCs.
2 men, same size, a romance between adults
I'm 27, I'm tired of these super cute stories, I want realistic stories, but NO tragedy