잘못하다. 잘 못하다. / 잘 못 하다. (X) / wrong vs wrongly.

잘못하다. 

I did it wrongly. 

 

잘 못하다. 

I don't do it well. 

 

잘 못 하다. (X)

'잘 못 하다'로 띄어 쓰지는 않습니다. (출처: https://www.korean.go.kr/...)

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Wrong vs Wrongly

Wrong and wrongly are both adverbs.

Wrong can be used informally instead of wrongly after a verb. In fact it is taking over from the word wrongly.

However, when the adverb comes before the verb we use wrongly.

For example:-

Sean Hodgson was wrongly convicted of murder.

I'm sorry if I've written anything wrong. / I'm sorry if I've written anything wrongly

According to Merriam Webster: "The best way to choose between wrong and wrongly is to rely on your own grasp of English. The one that sounds correct, is correct. If they both sound correct then either one may be used."

Feel the force!

출처: https://www.learnenglish.de/mistakes/wrongvswrongly.html