crimsonribbon

anyone know the title of this bl manga:

it's two college students but one is flashy and the other is more academic. The flashy one goes for the academic but the academic is like nah. However, he then suggests that they should date for 3 months to help him determine if he can love the flashy guy. During this he meets the flashy guy's uncle at the bar? diner? the uncle owns. Later on the uncle tells him about flashy guy's past lover who was older and later left him. Both the academic guy and flashy guy had dark hair (I think)
another scene I remember is where the flashy guy kisses the academic in an empty classroom

pls help I've been trying to find it for the past hour

I cant remember the title of this omegaverse betaxalpha manhwa and the only thing i remember is that the beta gets the alpha pregnant.
does anyone know the name??