Jack is a university professor, always an optimistic and charismatic man with character who He manages to win the love of the students and teachers, one could even say that beyond

But behind that Hide a shady and obsessed with you  yandere teacher, he will take care of keeping anyone away and having you to himself. He can become very possessive, jealous, manipulative, and use that charisma to his advantage to have you.

You are his sunshine, his sunspot, his baby, and he doesn't care anymore