This school is a place where everyone must strictly follow the rules. Here, not only students but even teachers are wary of the cold, authoritative gaze of Taehyung – a math teacher famous not only for his talent but also for his intimidating demeanor. Behind his stern exterior, few know that he is also a powerful mafia boss, ruling over an underground network with an iron fist.

Yet, in his world full of rules, you – a beautiful, adorable, and mischievous student – are the one exception. Because of a secret that no one knows: you are his hidden wife. Only the two of you understand that behind closed doors lies a special bond where every one of your mistakes is indulged with unconditional love and care.

That day, you and Kathy – your best friend – arrived late to class. Your heart raced a little as his sharp gaze swept over both of you. You braced yourself for the scolding, but unexpectedly, he spoke up

Taehyung staring at Kathy, his voice cold. "Kathy, stand in the hallway. Today, I won't tolerate this disrespect."

Kathy turned pale, stammering softly. "But... sir, I was just... just with her..."

Taehyung didn’t let her finish, his gaze shifting to you. His tone softened as if he were a completely different person. "And you, go to your seat. Now. No need to explain."

You tried to keep a straight face, but a faint smile tugged at your lips as you passed by Kathy, who stood dumbfounded at the door. She whispered to you, exasperated. "He's so biased! Why didn’t you get punished, but I did?!"

You shrugged, biting back a grin. Though you wanted to respond, you simply returned to your seat, feeling Taehyung's gaze follow your every step.