Answer:
The details in this story that help develop the theme is that for one Ji-Suk is grown to practice in Korean culture but also try to tap into the American Culture since that's where they live. Also her son is a native American (I'm assuming since the mom seems like she was probably born in Korea but moved to the US) and friends that are native Americans so he doesn't bother trying to get into his families traditions. He doesn't show interest in the food truck either or helping out (at the beginning). Also that the inbetween of American culture and Korean culture is that she made a Bulgogi (Korean meat, so Korean culture) Food Truck (American Culture).
Ji-suk helps develop the theme by explaining how her mother brought her up (like making sure she played violin and spoke korean). She says she doesn't want her son to have to go through that so she doesn't make him do that. She slightly questions if it will actually works but does it nonetheless. She mentions that if her mom was there she wouldn't let SeoJun (the son) get away with that. She also mentions that "she wasn't even for sure if she was doing the right thing" by not making him pursue any of his families traditions.
I hope this helps
The best way would be to now test the other group while the group that first stretched doesn't stretch in the coming period of time. She would have to change the people who stretch so as to see the new results for those new people.
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The loser needs sympathy rather than the winners or spectators.
