How about vs What about

How about : ~하는건 어때? 라는 제안할 때 사용하는 표현이다.
Use how about to make suggestion and open possiblities.

A : I have the day off from work tomorrow. What should we do?
B : How about spending the day in the city?
A : Nah, I don't feeling like traveling.
B : OK, then how about cleaning the house?
A : No way. I want to do something fun.
B : How about doing some shopping and then seeing a movie.

I'm going to have lunch. How about you?
나 점심 먹을거야. 너는 어때?

We'll need to talk about this again. How about meeting next week?
우리 이것에 대해 다시 얘기 좀 해야 돼. 다음주말 미팅 어때?



What about : 어떻게 돼? (상대방의 의견)을 물을 때 사용하는 표현이다.
Use What about to mention an objection or potential problem with the plan or idea.

A : Let's go camping this weekend.
B : But what about my guitar lesson on Saturday? (근데 토요일 내 기타 수업은 어쩌지?)
A : Just call the teacher and reschedule it.
B : And What about the English test on Monday? I haven't studied yet.
A : You can study on Sunday night when we get back.
B : OK, but what about the weather? Isn't it going to be rather cold?

What about the lost wallet? 지갑 잃어버린거 어떻게 됐어?

How about you? = What about you? (같은 의미)

A : How have you been?

B : Good. How about you?