Here are 4 tips that should help you perfect your Korean pronunciation of 긴소매:

• Listen to the way native speakers pronounce 긴소매: Listen to the word in isolation, and try to rely on your ears more than your eyes.
• Break 긴소매 down into sounds: say it out loud and exaggerate the sounds until you can consistently produce them.
• Record yourself saying 긴소매 in full sentences, then watch yourself and listen. You'll be able to mark your mistakes quite easily.
• Look up tutorials on YouTube on how to pronounce 긴소매.

To further improve Korean pronunciation, we suggest you do the following:

• Practice hearing the difference between commonly confused vowels: ㅓ(eo) and ㅗ(o), ㅡ(eu) and (i), and ㅗ(o) and ㅜ(u). Compare native pronunciations of words that differ only in one of these vowel pairings. E.g. try distinguishing between 솔(‘brush’) and 술(alcohol). Ask a friend to quiz you by randomly playing the audio for one or the other.
• Study the rules of consonant assimilation: (sometimes simply referred to as sound change rules). When one consonant comes into contact with another, changes in pronunciation often occur. E.g. when ㄱ(k) precedes ㅁ(m) or ㄴ(n), it become pronounced like ㅇ(ng) instead (식물 -> /싱물/). All such rules are covered in parts 11-14 of Go! Billy Korean’s YouTube series Learn Hangul .
• Internalize patterns of intonation through repetitive listening: Find a video or audio clip of a native speaker which you can loop. The voice should be pleasant to you. Commit to listening to the track multiple times a day. The best audio length and appropriate number of reps will depend on your own time constraints and skill level. You do not need to understand what is being said—the goal is rather to grow your intuitions for natural Korean rhythm and pitch fluctuation.
• Subscribe to 1 or more Korean teaching channels on Youtube: it's free and it covers the core topics of the Korean language. Check out Go! Billy Korean and Talk to Me in Korean to name just a few.