Missing (2)

Keith frown slightly as he stare at Lexi's blank face. At this point, Keith understood that she always nitpick at Lexi at almost everything. 

She may have gotten her revenge on the girls who were making fun of her everyday but against a teacher, she could not retaliate. She must have been used to being punished everyday since she just stood quietly at the side.

Meanwhile, Lucien frown at Leon's empty seat. 

The other students are also concerned about why he did not show up. His IQ may not be great but he was committed to studying. He never skip classes nor does he bully and intimidate others. 

In other words, he was a hard working student like his twin sister. 

So what exactly is going on?