This^ And also, when at the beginning or end of the word, ㄹ is pronounced as "l" (except for some foreign words like 라디오, where the ㄹ should be pronounced like "l", but sounds like "r").
In the North Korean dialect, ㄹ is always pronunced as "r" at the beginning and as "l" at the end.
There also exists a "Koryo-mar" (고려말) dialect, which is spoken by Koren minority in Russia and adjacent counters of the late Soviet Union. In this dialect ㄹ sounds like "r" when at the end of the word (hence Koryo-mar).
To avoid confusion with 물다 (mulda, “to bite”), as in many conjugations both verbs sound and are spelled alike (both have the stem 물어 (mureo) due to irregular conjugations), in most usages the verb is combined with 보다 (boda, “to try”) to form 물어보다 (mureoboda) to form the same meaning.