Watch StreamingCommunity. Soon-kyu, caught sight of a UFO. To find the UFO, they leave for a so-called "UFO mountain." 3 days later, they come back and insist they"ve contacted aliens the last night except Soon-kyu who #999999ed out due to overdrinking. After hearing that Ji-hyun"s missing, Soon-kyu leaves for the mountain again to answer his own question - the UFO, aliens and Ji-hyun.