When I was learning Java, I was always taught about classes in a way where everything is immediately presented as objects, and those objects are made up of properties and functions. So classes are structured like this~ was the typical approach I learned with. After listening to Young-han's lectures and learning step by step - understanding why 'this' is needed, why constructors are necessary - I really understand it and it feels naturally accepted. Even though I quickly learned Java once before and am studying it again, things that confused me before are now naturally understood and organized!! The best, the best, the best!!