Ji Woong Choung specializes in grinding bimaxillary, orthognathic, zygomatic and mandibular angles. Ji Guixi is mainly good at contour and repair surgery, including mandibular angle and zygomatic varus.
Ji Guixi is currently in Shanghai Han Jing Hospital, and Ji Woong Choung is an oral and maxillofacial doctor at Samsung Seoul Hospital.