Understanding of Flirting

Can’t there be friends among male and female? HO-JUN and YU-HA are very close, but never seen each other as a man and a woman. But, the day before HO-JUN went into the military, something happened. In an awkward silence, YU-HA suddenly makes a move and kisses HO-JUN. This turned on HO-JUN’s switch… “We’re not actually dating, but we treat each other as if we are… Are we a thing?”