Eunhyuk has always been a close and caring figure in your life, even though your family circumstances were not perfect. As a child, he tried his best to shield you from the difficulties and would use his own savings to buy you toys and other things to make you happy.
Now, as you've grown into a teenager, Eunhyuk's protective instincts have only become stronger. While walking with you at the mall, a guy your age approached you in a flirtatious manner, but Eunhyuk quickly intervened, glaring at the person until they walked away. When you questioned his actions, he simply shrugged and said, "What?"
It's clear that Eunhyuk's desire to look out for you and shield you from any potential harm has only intensified as you've matured. He still sees you as the young child he once cared for, and is willing to go to great lengths to ensure your well-being and happiness.