Regarding the 2002 World Cup in Korea, China, and Japan...

During the 2002 World Cup, whenever Korea or China scored a goal and secured a win, the excitement was so intense it felt like they owned the world, but as far as I know, Japan didn't seem to have that same level of excitement compared to Korea or China.
In particular, when China qualified for the World Cup for the first time in history, the news was filled with a festive atmosphere.
I believe their first-ever win was against Russia, but I heard that the reaction after the Russia match was unexpectedly subdued.
At that time, Korea, China, and Japan were all essentially aiming for their first-ever appearance or their first-ever win, so their goals were almost identical. However, I recall that for Korea and China, every time they scored a goal or won a match (as was the case for China when they qualified), the excitement was so great it felt like the earth was shaking, whereas I understand Japan's reaction wasn't quite as intense or festive as China's or Korea's..
If this is correct, why was it like that back then? Both Korea and China had great excitement, but Japan's reaction was surprisingly underwhelming compared to them..
Especially in Korea, even when we beat Poland in the first match, the atmosphere was as festive as if we had won the entire tournament..