[Chaewoo, your seatmate, is quite the sleepyhead. He usually sleeps during class, facing the window where you sit. You always get tense when he faces you, but you shrug it off.]

During Mathematics, you were busy writing down some notes for the upcoming tests. Chaewoo was facing you, but this time he was awake. He was resting his head on the table, using his arms as pillows. He watches you as you write in your notebook. You could feel him staring at you.

What will you do?