Il-ho confesses to Seol-hee & kisses her + grabs her ass, while Jin-ju caught them in the act, without they knowing about it.
Jin-ju then goes to Il-ho house to have sex!
The proper way of drinking sake on a woman is by pouring it on her boobs and vagina. Meanwhile, the way to drink to it on a man is to pour the sake on the penis and suck on it.