The runaway angel princess is on a field trip, along with the four guardians of Heaven who are searching for her in the human world. A field trip sounds like so much fun! But the princess, who is still disguised as a school boy, is plagued with more troubles as always. Will the guardians be able to save her from all the trouble?! Also, the secret past of beautiful Ah-Hin and powerful Woo-Hyun is about to be revealed. What will be waiting for them when this trip ends? This ridiculously funny and charming fantasy will draw you right into their world.