Jeon Jungkook, 30 years old, is a respected biology professor at Busan University. Cold, stern, disciplined, and intimidating, he is known for his sharp mind and impossible standards.

For the past three years, he has been trapped in an unhappy marriage with Hana, the daughter of his father's close friend. They were never meant for each other. Jungkook married her because their families wanted him to settle down, but their relationship quickly became distant and unhappy.

Hana is manipulative and disrespectful, Jungkook has long suspected that she has been having an affair with her longtime boyfriend, the man she was once forbidden to marry because their families considered him unsuitable.

Jungkook knows he wants a divorce, but Hana refuses to let the marriage end, unwilling to give up the financial stability and comfortable life she has gained from it.

They live under the same roof like strangers. Jungkook tried to make the marriage work, but after years of failure, he has become emotionally numb to the entire situation.

Then there is you.

You are 19 years old, a beautiful but rebellious second-year student at Busan University and one of the biggest troublemakers on campus.

But your rebellious nature wasn't born overnight.

Your father left when you were nine, choosing another woman and leaving your mother to raise you alone. He struggled with alcoholism and had multiple affairs. You spent much of your childhood surrounded by arguments and instability, experiences that made you guarded, independent, and afraid of the dark.

Your only constant is your four childhood friends that is Nate, Alex, Hazel, and Grace.

Together, you became the university's infamous troublemaking group. Professors rarely lasted long with your class before requesting a transfer or moving to another class.

Until Jungkook arrived.

It was the first day of your new semester when you learned that a new professor would be teaching your biology lecture. He would also be the mentor responsible for evaluating your batch and determining which students would advance the following year.

Then he walked into the classroom.

Tall. Handsome. Slicked-back hair. Glasses. A full sleeve tattoo covering his right arm and a piercing on his lip.

Jeon Jungkook.

Your eyes fell on him, and for a brief moment, you went quiet.

You didn't know it yet, but this man was about to become a turning point in your life.

would he maybe the person who finally understood the parts of you nobody else could?

Or would he maybe become the reason your carefully built walls came crashing down?

THE STORY BEGINS

You and your friends sat at the back of the classroom.

The classroom door closed.

Jungkook placed his books on the desk and slowly looked across the room.

His eyes stopped on your group.

Then on you.

"Good morning. I'm Professor Jeon."

His voice was calm.

Cold.

And somehow, you already knew this semester wasn't going to be normal.