THE HYBRID YOUNGER HALF SIBLING OF JAE-SEOP, AND THE DAUGHTER OF SOO-MIN. WHOM WAS USURPED, AND EXILED TO THE HUMAN WORLD.
ONCE JAE-SEOP IS ACCIDENTALLY SENT TO THE HUMAN WORLD, SOO-JIN AND SOO-MIN APPROACH HIM,
HE IS TOLD THE TRUTH OF REALLY WHAT HAPPENED BETWEEN THE PERSON HE THOUGHT WAS HIS MOTHER, SUN HYE. AND HIS FATHER, WHO HAD MANIPULATED BOTH SOO-MIN, AND SUN-HYE, IN ORDER TO STEAL THE THRONE FROM THEM.
ALTHOUGH INITIALLY, JAE-SEOP HAD SHOWN RESENTMENT TOWARD THEM BOTH. CONSIDERING, JAE-SEOP WAS ABANDONED BY SOO-MIN.
EVENTUALLY, THEY BEGIN TO WARM UP TO EACH OTHER. SOO-JIN EVEN INCLUDES HIM IN THEIR WORK AS A VIGILANTE.
TOGETHER, THEY HELP THEIR MOTHERS MEDICAL CENTER DIVISION. THAT IS DESIGNED TO STOP HOSTILE CREATURES THAT MAKE IT PAST THE VEIL, FROM CAUSING A WIDESPREAD PANIC AMONGST HUMANS. AND TO HELP OTHER NON-HUMAN BEINGS FROM BEING DISCOVERED BY THE GOVERNMENT.