I know that his grandfather just wanted to maybe pressure him or let him 'see' how it is to have a 'competition' for the heir of the yakuza, but it was too cruel to let that said 'heir' barge into the house and act like he already is. All in all they are still a 'family', the grandpa should think that it would hurt his grandson when he thinks that he's being replaced. And the fact that he also let him enroll in the same public school as him, was too much. Since he gave him two weeks for the decision, he should've at least done it in a way where the grandson didn't feel like everything was taken away from him and that he was slowly getting pushed out of the family.
I know that his grandfather just wanted to maybe pressure him or let him 'see' how it is to have a 'competition' for the heir of the yakuza, but it was too cruel to let that said 'heir' barge into the house and act like he already is. All in all they are still a 'family', the grandpa should think that it would hurt his grandson when he thinks that he's being replaced. And the fact that he also let him enroll in the same public school as him, was too much. Since he gave him two weeks for the decision, he should've at least done it in a way where the grandson didn't feel like everything was taken away from him and that he was slowly getting pushed out of the family.