Koreas don't like Japan it is well known fact , and Japan does not likes Koreans
When Korea plays Japan in football Korea generally owns Japan , becasue they are much better team, Just a constant struggle to define own culture better then others , and this goes beyond to
WW2 or Prior time due to conflict of war
Rivalry exists in Corporate world
Social surroundings
Sports Team based (Football , Volleyball, Basket ball , any regional team sport)
Single Events
Even debate on best combat form Korean like their
Taekwondo
Japanese , favor their own Judo / Samurai - Sumo / Karate
Even the foot debate is high as Japanese like the raw/ low fat food while Korean typically like
extra Hot spicy food