I read it a few years back so I can't remember the plot well. The scenario was taking place in a apocalypse I think and it was a non coloured drawn. Both the character meet at a forest. One of the main characters sibling was a scientist or some sort.
I can't remember anything else.
Nahh man. This isn't the one
I finally found it. It's radio strom
Guys recommend me some good beta × alpha stories
Look at Me (Tansan)
https://www.mangago.me/read-manga/look_at_me_tansan/
MR. BETA
https://www.mangago.me/read-manga/mr_beta/