Spoiler warning!! . . . . . . . . He does! I recommend you keep reading and don't drop this ^^. Not only does he grow a backbone [kinda] he also gives like a "reality check" to that dork (๑•ㅂ•)و✧ But it will take a while for him to actually do it.
HE DOES!! but it’s around chapter 40 or somewhere there (maybe even before). He lowkey realizes that the other dude is treating him like shit and doing stuff like that on purpose. He eventually breaks off the “friendship” he has with the guy to be with the ml.
tbh grandpa's already on death's door and everybody knows it mc is just too stubborn to accept it like grandpa already know his time is up but idk why he wont tell mc to accept that
this wouldnt have happened if it were me