Question

마크는 나랑 성격이 비슷해 Expressions of comparison and contrast require the use of a particle conveying the meaning of 'with' or 'and'.All three principles -과/와, -하고 and -(이)랑 mean 'and' or 'with'. -하고 and -(이)랑 are viewed as spoken forms and tend to be used in casual situations. -(이)랑 sounds the most informal and should be avoided in more polite speech. -과/와 is a formal written form occurring in formal structured speech.

Accepted Answer

Mark and I have similar personalities

Front	마크는 나랑 성격이 비슷해
Back	Mark and I have similar personalities
Notes	Expressions of comparison and contrast require the use of a particle conveying the meaning of 'with' or 'and'. All three principles -과/와, -하고 and -(이)랑 mean 'and' or 'with'. -하고 and -(이)랑 are viewed as spoken forms and tend to be used in casual situations. -(이)랑 sounds the most informal and should be avoided in more polite speech. -과/와 is a formal written form occurring in formal structured speech.

이)랑 하고 Speech Formal 마크는 나랑 성격이 비슷해