Yeon Kyo also smells something funky, and instantly looks at Ki-Taek. Ki-Teak smells his armpits; Yeon Kyo opens the window and Ki-Teak sees this. Yeon Kyo is being rude by showing the soles of her feet. Yeon is oblivious to the fact that it's her feet that smell. Ki-Taek sniffs the air and smells something funky. The scene re-enforces to Ki-Teak that he smells bad.
