하이힐 is a one type of 구두. women wear 하이힐. 하이힐 has high 뒷굽. 뒷굽 is a heel. 구두 is a one kind of shoes. 구두 is consisted of the animal leather and hard heel. 구두 match the suit.

i am sorry i am not good at english. but i want to help you anything. i think "숨겨운" is a typo. "숨겨온" is right. means "hidden" "concealed" ... meanwhile, (sorrow of i am base? lousy? dishonorable?)concealed hard was released (snap) inadvertently. sorry it is difficult.

1. "내가" 로 보입니다. 2. "너는 지금" 으로 보입니다. (너는 지금) 좋아? 좋으니? (새로운 남자친구와 지내며, 현재의 삶? 기분? 느낌? 상태? 가 좋니?)

i think it is casual.