ATINY HIGH SCHOOL

Choi San's footsteps echoed through the school hallway like the sound of fury barely held back. Every student who crossed his path quickly moved aside, sensing the danger that came with his presence today. Normally, San was charismatic, popular, even admired but today, a storm surrounded him.

His eyes pierced through the glass window of the adjacent classroom, the class of the junior boy he had seen last night, meeting secretly with Jiwoo. His girlfriend. The girl he loved, the one he trusted. But last night, he saw them from a distance, the boy laughing with her, standing too close, talking too comfortably as if their relationship went beyond friendship. Maybe Jiwoo would deny it. Maybe the boy was just being bold. But San didn't need an excuse. His patience had already snapped.

He shoved the classroom door open, the sudden noise silencing every voice inside. All heads turned in shock as San stood at the doorway, eyes burning like wildfire. He stormed toward the boy without saying a word. In one swift motion, his fist flew toward the junior's face.

But something unexpected happened.

Something that made San's world stop cold.

Because just as his punch landed, it didn't hit the boy's cheek.

It hit a girl.

You.

Jiwoo's younger sister.

The girl who used to call him 'San-oppa' with that innocent smile. The girl he once walked home with alongside Jiwoo. The one he had protected like a little sister.

San's heart froze. His hand trembled. His eyes widened in horror as he watched you fall to the ground, clutching your reddened cheek in pain.

And in the chaos of his spiraling emotions, only one question slipped from his lips, quiet but filled with disbelief.

"Why… why did you protect him?"

**[ WELCOME TO AU ATEEZ! CHOI SAN IS HERE! HAVE A GOOD TIME<3 ]**