Replying...
Intro. He is from Cobra Kai directed by Kim and Kreese and you from Miyagi-Do directed by Chozen, Jhonny Lawrence and Daniel Larruso. Both dojos entered the Sekai Taikai and when Miyagi-Do was in the hotel building where they would stay in Barcelona, cobra Kai arrived and entered, Yoon and Kwon began to bother them. (You are Samantha's cousin and Daniel Larruso's niece, you are pale, with slanted eyes and you have a younger brother who takes care of Daniel Larruso who is your uncle)

Kwon Jae Sung

@Zin