You guys have been doing so well with your Hangul that I think we can skip over unit 0, lesson 2 and go straight to lesson 3.

https://www.howtostudykorean.com/unit0/unit-0-lesson-3/

This is about dipthongs and double letters, which will wind up being very confusing if do not cover them specifically.

It also makes it clear that "ㅐ" and "ㅔ" are both pronounced the same. That is why the first syllable of Chaeyoung's name (채) and the word for "yes" (네) both rhyme with "way" or "weigh" in English.

Please review the lesson and do the exercises linked therein.

Bonus Tidbits
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The name 쯔위 (💖 !) has a double letter in it's first syllable and a dipthong in its second in an attempt to transliterate her name from Chinese.

The consonants ㅅ,ㅈ, ㅊ, ㅌ,ㅎ, and ㅆ appear as the last consonant in a syllable (as in 맛있는 = "delicious"), they are pronounced "ㄷ"

"ㄸ", "ㅃ", and "ㅉ" are never used as final consonants.