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Reall
In this case it was a given, Seo's Dad worked for Kwon's family and that was the wholllllle plot of story. It's not so far fetched the boss's family will interact with the employee's family at least once, and that once was when he broke the plate. They were never friends, but they did meet because of the nature of the family's employer and employee situation.
Every freaking time the main leads ends up being past childhood friends or something. I AM SO DONE WITH IT! It's like every kdrama ever. Can't they just be normal people who met as adults?