The play is adapted from the prototype characters and stories in "Grimm's Fairy Tales", and most of the stories and characters in the play are from the characters in the book. Nick Burkhardt (David Giuntoli) was originally just a policeman in the Portland Police Department. His fate changed completely after he knew that he was a descendant of the "Grimm" family. In addition to fulfilling his police duties, Nick must also hunt those monsters in fairy tales. At the same time, because of the special identity of "Grimm", he met many kind "Grimm" creatures and became their friends. Some beasts and animals transformed into human forms and hid in human society. They are planning to attack humans. After learning about the responsibility he bears, Nick is determined to protect humans at all costs.