Why people from south korea are like to claim to be chinese in America

A friend migrating to America is back recently, at the lunch time, she memtioned that some people from south korea are not confident any more, they like to claim themselves to be chinese before American. That makes me so surprised that fews years ago we are still fond of the culture of south korea, why they change so fast? There is only one answer to explain it: china has developed into a powerful country.
When talking about how does she feel after back to motherland, she said objectly that china has really grew up, the change is obvious and great. The street is more wider, house is more higher, the urban appearance is more beautiful, nightscape is more bright, which is changed a lot comparing with the year 2005, but she also implicitly said that she did not dare to drive on the road.
I know what did she mean, because she is not the only one person to say that, several years ago, I drove airport to pick up a canada friend, she also said it on my car. She grabed my hand on one side, asked me to drive slowly on the other side. Then I told her that if we drove in her speed, it would have a long time to reach the destination. Her words made me think about a experience one of my friend.
That happened in France, he and two old writers went to the countryside by taxi, it was rainy day with strong wind, on the road a wagon was always stopping them, there were two beauty in the car, their carwheel curled up dust which dirtied my friend’s front windshield. Then he said to the driver: can we overtake it? The driver answered that it was not polite overtaking on such kind of situation. when they were still discussing, the wagon before them stopped, and a gentleman came over and whispered to his driver, then back to his car and driving their wagon into the side of road. Afterwards, he asked the driver about what that gentleman has said to him, the driver told him that: he said it was not fair that their car was always before ours, he also said he did not want to let the two lady in his car think that it should be like that. These words made my friend feel shamed for several days.
Even though the korean claim them to be chinese, when the Japanese begin to claim they are also chinese, then we are really entering a moderizational society, all we need to do is to improve the level of our spirits civilization on the basis of material civilization, then it would not be too far for Japanese to claim they are chinese.
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