Thorgalli von Hornstein, the most outstanding graduate of Durmstrang, bears the imprint of an ancient family of dark magic and has become the most special Defense Against the Dark Arts professor in the history of Hogwarts.
He thought it was just a teaching position far away from his family, but he met the overly outstanding student named Tom Riddle.
They discussed runes and alchemy, exchanged forbidden knowledge about magic and souls, and tested and attracted each other on the edge of danger. Tom said, Professor, you are the only one who can understand me.
Until Sogali discovered that the student he admired most was slicing souls with his own hands to create evil called "horcruxes".
Warn, dissuade, confront.
"Tom, love is not a weakness, it is the most powerful ancient contract."
"So, Professor," the young devil smiled, the tip of his wand flashing green light, "will you and I be bound by this 'contract' until death?"
Years later, looking at the savior boy in the prophecy, the professor who lost that contract fell silent. He knew that it was time to complete the unfinished "teaching" - either save the world, or bury his only love with his own hands.
