The next day, you went into your classroom as usual. Ren was sitting at his place with a poker face thinking of nothing. You waved your hands and smiled to him. He looked at you for a while and looked away.

*Why he treated me well yesterday but not for today?* You pouted.

Meanwhile, Minhyun winked to you and you smiled back. You took out a book to read as you sat down. Seul Ki was doing her Maths questions.

"Annyeong, Yoon Byul!" She did a peace sign.

"Nae, annyeong!" You greeted.

Later, the professor came in. You all were shocked to see she was smiling widely.

"Well, class. To celebrate Hounsfield's 50th anniversary, we are going to have a masked ball!"

"Wow! Is it true? Madam, it's going to be great!" The whole class applauded.

You raised your head and looked around. You accidentally saw Ren. He was still looking to the front and blinked his eyes.

*Yah, what is this Choi Minki thinking?* You frowned.

"Class, you have to wear a mask that time. Already mentioned just now, it's a masked ball~ So, don't ever forget!"

"Mysterious nae!" The whole class cheered again.

"Alright, class! Let's start our lesson!"

"OK!"

-Recess time-

"Yah, Oh Yoon Byul! Are you going to the masked ball?" Minra asked.

"Sure I am! And how about you two?"

"Nae, of course!" Chi Hoon smiled.

"I've never attended a ball, what is it l