I'll drop this. even though they were not related by blood but the feelings of his sister regarding him is genuinely pure as a sister. also the mc for 18 years didn't show any motives, now he's suddenly confessing? and the sister would suddenly fall for it because of the plot? not to mention that he already has his best friend and student which means he's already collecting women for a harem? no thank you. so I'll drop this bs! and author...