As the name suggests, trainee fairies are little fairies who are still training hard at the Fairy Academy. Every year, 10,000 goblins come to the human world for internship, and only the 9,999 goblins who complete the task the fastest can officially graduate. This means that only one poor little girl will stay in the human world until the task is completed.
And this poor little guy is the famous dark fairy in the fairy world - Gu Anan!
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Hey, who said only angels have laws? Who says only angels can fall in love? I watched "The Rules of Angels" by JJ Dora before and then "The Rules of Fairies" by An An. . >_