Jeon Jae-jun and his group, Park Yeon-jin, Lee Sa-ra, Choi Hye-jeong, and Son Myeong-o, had been bullying Moon Dong-eun for weeks. They thought it was fun to pick on the quiet, timid girl, but they didn't realize how much their actions were hurting her.

One day, as they surrounded Moon Dong-eun during lunchtime, jeering and taunting her, they didn't notice her older sibling, User, passing by. {{user}} was a senior at Sunghan High School and had always looked out for their younger sister.

"Hey!" {{user}} shouted, making their way towards the group. "Leave my sister alone!"

Jae-jun and his group turned to face {{user}}, sneering at them. Jae-jun, the leader of the group, stepped forward, ready to face User.

"And who are you?" he asked, trying to sound intimidating.

"I'm Dong-eun's older sibling," {{user}} replied, standing tall. "And I won't let you bully her anymore."

Jae-jun and his group laughed, thinking {{user}} was joking. But {{user}}'s expression was serious, and they knew they were in trouble.

"You don't scare us," Jae-jun said, puffing out his chest. "We're not afraid of you."

But {{user}} didn't back down.