geuphaeseo deiteoreul kyeossneunde yogeumi manhi nawa beoryeosseo.

I turned on mobile data because I was in a hurry, and the charges ended up being high.

Breakdown of geuphaeseo deiteoreul kyeossneunde yogeumi manhi nawa beoryeosseo.

• ~이: subject particle
• ~를: object particle
• 많이: a lot
• 켜다: to turn on
• ~해서: because / so
• 급하다: in a hurry / urgent
• 데이터: mobile data
• ~는데: but / and
• 요금: charge / fee
• 나와 버리다: to end up coming out (regretfully)

Questions & Answers about geuphaeseo deiteoreul kyeossneunde yogeumi manhi nawa beoryeosseo.

What does 급해서 mean here, and how is it formed?

급해서 comes from the adjective 급하다 (to be urgent / to be in a hurry) + -아서/어서 (because, or so).
So 급해서 = because (I was) in a hurry / since it was urgent.
In this sentence, the subject (I) is omitted, which is very common in Korean.

Why is -아서/어서 used after 급하-, and why is it 급해서 (not something else)?

The connective -아서/어서 attaches to the adjective/verb stem:

• 급하- + -어서 → 급해서 It’s -어서 (not -아서) because many stems take either form depending on pronunciation patterns; 하 + 어 → 해 is also common, but 급하다 becomes 급해서 specifically.
  Meaning-wise, -아서/어서 gives a natural “reason → result” flow: Because it was urgent, I turned on data…

What exactly does 데이터를 켜다 mean? Is it “turn on data” like on a phone?

Yes. 데이터(를) 켜다 is commonly used to mean turn on mobile data (cellular data).

• 켜다 = to turn on (power/setting)
  So it’s like enabling the data connection on your phone.

Why is there no object particle after 데이터? Shouldn’t it be 데이터를?

You can say 데이터를 켰는데, but in casual spoken Korean, object particles like -를/을 are often dropped when the meaning is obvious.
So:

• 데이터를 켰는데 (more explicit)
• 데이터 켰는데 (very common in speech)

What is the role of -는데 in 켰는데?

-는데 links two clauses and often implies:

• background/context (“I turned on data, and then… / and you know…”)
• contrast or an unexpected result (“…but then…”)
  Here it works like: I turned on data (because I was in a hurry), but then the charges ended up being high.
  It’s softer and more conversational than a strict -지만 (but).

How does 요금이 많이 나오다 work literally? Why does “come out” mean “cost” or “be charged”?

나오다 literally means to come out, but in billing contexts it’s a common collocation meaning (a charge/fee) comes out / is charged / ends up being (an amount).
So 요금이 많이 나왔다 means the fee/charges came out high → the bill was a lot.

What does 많이 modify here, and does it mean “many” or “a lot”?

많이 is an adverb meaning a lot / much. It modifies 나오다 (came out/was charged).
So 요금이 많이 나왔다 = the charges were a lot / the bill came out high.
(“Many” is usually for countable nouns, but 많이 as an adverb is “a lot/much.”)

What is the nuance of -아/어 버리다 in 나와 버렸어?

-아/어 버리다 adds a nuance like:

• something happened completely
• often with regret, annoyance, “oops,” or unwanted result So 요금이 많이 나와 버렸어 implies: The charges ended up being high (and that’s bad/annoying/regrettable).
  Without 버리다, 요금이 많이 나왔어 is more neutral: The bill was high.

What tense and speech level is 나와 버렸어?

• 나와 comes from 나오다 (to come out)
• 버렸어 is past informal (해체)
  Overall it’s casual past: ended up coming out / ended up being charged.
  The whole sentence is informal, like talking to a friend.

Can you break down the sentence structure chunk by chunk?

Sure:

• 급해서 = because (I was) in a hurry
• 데이터 (를) 켰는데 = (I) turned on mobile data, and/but…
• 요금이 = the fee/charges (subject marker -이)
• 많이 = a lot / heavily
• 나와 버렸어 = ended up coming out (as a charge), unfortunately / regrettably
  So the structure is: Reason → action → unexpected bad result.