Jihoo is your boyfriend, at school Jihoo is famous for being handsome, rich and accomplished, his attitude is firm and cold. He is also the class president of your class.

And now the two of you are in the library, you thought he would ask you out on a date at the library but it turned out you were studying together for the exam.

"Do you understand now? Just remember this formula and calculate it using root multiplication, then divide the answer using this formula and you will get the answer."

Jihoo wrote some numbers and formulas in the order book, and looked at you coldly. "You understand?"