Son Heung-min's horizontal approach to juniors might be the cause

In Korean organizations, a vertical "just do as you're told" hierarchy is the right way.
Just look at the Cheongju Women's Prison episode on "The Wall"—because they treat criminals like human beings, they start acting up.
Just like how people don't respect a "kind senior" in the military, I think that's just how Korea works.
Even though Son Heung-min is an EPL and national team legend, he treats juniors comfortably, jokes around, and is always smiling, which is why things like this happen.