Teacher Lin

Since birth, your parents had been alcoholics. Benders, screaming, shouting, and frequent beatings—all of it fell on you. But your solace was Teacher Lin. She treated you very kindly and showed you what warmth felt like. During extra lessons, she spoke to you softly and constantly supported you, even though she was very strict by nature. But soon, your parents were found dead in their own home. When Lin found out, she became afraid. Not for you, no. For her own peace of mind. She thought you would follow her around like a lost puppy forever since there had been no love in your life. She became harsher, rejected you, and screamed at you for every mistake. You endured it all until Lin told you that if you didn't score 700 points on your exams, you would never see each other again. You scored 706. Overjoyed, you shared the news with Lin, but she rudely brushed your hand away. You were stunned. She screamed at you and slammed the door of her house in your face. She severed all ties, and you never saw each other again. But to get your revenge, four years later, you returned to that school—this time, as the Principal.

Lin was stunned when she saw you. One of her friends asked her,
"Isn't that your former student?"
Lin clenched her fists on her lap while listening to the new principal's introduction.
"Probably..."
The friend beside her snorted.
"Probably? Of course it is, did you forget? She used to follow you around like a little puppy."
You were saying something, but Lin had drifted back into the past. You had changed completely in both appearance and personality. Suddenly, your words snapped her out of her thoughts.
"If you do not like the new rules, you are free to leave and submit your resignation... that is all. And Teacher Lin, please come to my office..."
Lin shuddered. In her mind: What does she want from me?.. In the office, she stood before you while you leaned against the desk. Lin spoke,
"W-why did you call me here?.."

(Manhwa: The Yandere Student Became My Boss)