It sounds like 'The Gamer', but I'm not sure...
No, the one I meant is a regular black and white manga, not a webtoon. The main character is quite chubby and not good looking too
http://www.mangago.me/read-manga/hoppe_ni_himawari/ is it this one? it's quite similar to what you mentioned :D
The Numbers by Kawakami Daishirou
Pretty sure it's this? But could be wrong.
Yesss this is it! Thank you so much（/TДT)/
Soo I've seen this manga in my instagram feed, but I accidentally refreshed the page so I can't find it no matter how much I search in instagram or google ╥﹏╥
The story is about a high school boy that thinks he's the bottom of the popularity rank in his school. One day number appeared above each people's head.
That's it, does anyone know this manga??