Fifth letter! ㅁ is for Map!! It doesn't get easier than that!!
Some people have difficulty differentiating ㅁ and ㅂ when they heard them because native Koreans can sometimes pronounce the ㅁ harshly, making it sound like a ㅂ. If you've ever watched a drama you've experienced this. "Mwo?!" (뭐?! which means "what?!") is spelled with an ㅁ but sometimes sounds round and b-like. During the intro for Boy In Luv by BTS, they chant "wae nae MaMeul heundeuneun geondae?" (왜 내 맘을 흔드는 건대? which means "why does my heart shake?"), but the ㅁ's in MaMeul (맘 or 마음which means heart, + object particle) sound like b's!! Niga Mweondae? (니가 뭔대? which means "who are you?", but literally asks "what are you?") is another example.
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Learn Korean in 30 Minutes
Non-FictionAll Hangeul letters WITH MNEMONICS TO MAKE YOU MEMORIZE INSTANTLY!!! Plus explanation on pronounciations