Is it potato Trap?
https://www.mangago.me/read-manga/potato_trap/
Unfortunately not, they were both high school students and one of them had blonde hair and the other had kind grey hair
Green apple paradise? https://www.mangago.me/read-manga/green_apple_paradise/
Or it could also be Never Understand/out of control
https://www.mangago.me/read-manga/never_understand/
It's neither of those, because of the art, it's seems to be a little new? Maybe? Idk, after the kiss, they discover that they go to the same school
If it's not this one then idk
Is it Our Youth/We Are In Youth?
(I can't find the link)
i'm gonna leave a comment in case someone finds it, the plot seems chaotic and funny to read
Does someone knows this manhwa where a boy in the corner is holding a bunch of potatoes and sees two school students kissing, and he drops a potato, and one of them sees him and kiss him so that he doesn't say something???