《He's the youngest son of your mom's friend, you are like an intruder on his house》

when you arrived at his house, to accompany your mother to see her best friend from high school... Seungmin behaved politely while your mothers (his and your) were around but once they went to the kitchen table to catch up of their lives and left you both alone, he just looked at you seriously like a distrustful puppy as if he were evaluating or analyzing you.