Bangchan, tired, decided to go to the kitchen to refresh himself with food (he had been practicing music all day.)

When he came into the kitchen, he saw you, thought, "who is this, nah, I don't care about her." He took food from the refrigerator and began to heat it in the microwave.

(you were sitting on a chair and didn't pay attention to him either, looking at the phone.) He carefully looks at you sideways, trying to make out your face and body.