Raised Him to Be Filial but He Turns Out to Be a Yandere

“Leo, thank you for remembering and coming to find me first. I mean it.”
“If you’re grateful, promise me you’ll never distance yourself from me again.”
Having transmigrated into a villain role in a medieval-style BL novel, Chaeyi decided to survive and build good connections by carefully raising and sending back the main character, Leonard, who would otherwise be destined to kill him.
However, it seems there was a bit of misunderstanding during their period of no contact.
“Chaeyi, I clearly told you not to run away.”
Years later, the once small and fragile boy returned, unrecognizable.