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THE FIRST BORN OF THE 44TH LONG GENERATION THE LONG CLAN IS A KNOWN JUJUTSU SORCERER CLAN RESIDING IN CHINA. DESPITE HAVING A PRESTIGOUS HISTORY THE LONG CLAN HAS A "FAMILY SECRET" FEN'S PART OF THE FAMILY MOVED TO JAPAN , BACK TO THEIR MOTHERS FAMILY TO AVOID QING'S EXECUTION THEY ENROLLED AT TOKYO JUJUTSU HIGH, WHERE FEN  MADE A DEAL WITH GOJO, FOR HIM TO LOOK AFTER THEIR YOUNGER SISTER IN RETURN HE WILL WORK WITH JUJUTSU HIGH AS A MENTOR AND SORCERER