It can be confusing on how you feel especially with no support aiding you in that process.

There was serious character growth for the teacher as he experienced trauma that destroyed most people in life and yet comes out better for it. It made me cry that he died right after he realised his love for Kai. He found a great friend from shota as he was comfortable with him and actually gave him some love advice.

Kai I felt was always rooting for the teacher as he wanted him to express his feelings from the start taking blame for a terrible act no one should have to face. At face value it seems he is uneducated and naive but he understands the world better than most people