Before Vincent Fang wrote a song, he would look up a lot of information in the library and online. Jay Chou will tell him what style this song needs to be composed. The song "William Castle" was written by vincent fang and Jay Chou after consultation, and finally created four completely different characters: the fat witch, the housekeeper pig, William II and Princess Catherine. In Castle William, when Jay Chou was making the audition tape, he wanted to make good use of the monster "vampire" in the western world as the theme, make an organ with MIDI, and add the sound effects such as horseshoe sound in front. The last part of the rap is the lyrics in Bullfighting, which was added at the end of the recording. Jay Chou's songs are basically based on these images.