Hangul – ㄹ R or L
This letter (rieul) can be pronounced like an R or an L.. it’s sort of in between to be honest. At the start of a word it is pronounced like an R like in really. At the start of a syllable it is also pronounced like an R. At the end of a word it is pronounced more like an L like in the word seal.
Read through more Hangul Lessons. You can also look at resources to learn to read Hangul.