Engagement? - S1.E21

Young Guk becomes confused after having kissed Dan Dan on the lips, and Dan Dan, who finds it inconceivable that their lips touched, becomes bothered by it. Meanwhile, Dae Ran gets annoyed with Ki Ja and Sa Ra bickering about their circumstances. To cool things down, she gives Young Guk the advice of getting engaged to Sa Ra, and Young Guk thinks about it.