Responses
ehh not sure if they ever explained this but hayang (하양) means white so its either because ian is pale or because he's innocent/pure
It was Ian's angel nickname if I remembered correctly
Yang is like an endearment you use to call someone younger. Since his last name is Ha, so Ha-yang
Why does kyungbin call iam hayang, from what I remember that is not his last name (￣∇￣")