Add about my first answer... Overall, a lot of wrong grammar sentences. then, what I what I think this letter(?)'s contents are... On Sunday she will get her phone and swimsuit. She is boring about one-piece swimsuit. (I think, she expressed meaning of bored as 'sick'.) She had disagreement with her mother about public school. And,, I was little upset about her who wrote this letter. because she used swear word. ‘머더퍼킹 애스홀’ means fuck!! and ‘아이씨’ means damn!! I think she expressed frustration about her mother. Terrible!!! I personally hate it... Ah!! Do you know what means WTF? Let me know if you know. I hope my answer helps to you. Thank you.

I think, it was written pronounced of english by korean. Umm...like, you write pronounced of korean by english. For example, the word 'Korea' is meaning of '한국' and the word '한국' is written pronounced of korean by english, 'hankook'. got it? So...I will write those sentences by english, as hard as i can. and if I can't interpret, I will express '@' 오 예~~ 라이크....음......재크? → Oh yeah~~ like umm...Jeak? 무슨 곤충같은 이름같으니 → Like insect's name 오!!!!! 개스 왓!! (ㅋㅋ 개스. 풋) → Oh!! guess what!! (kk guess. k) 아이 앰 개팅 마이 폰.....인 투 데이즈!!!! >.<; 푸하하하하하핫!!! → I am getting my phone in two days. haha!! 흠.......*Z-연이 완전 흐뭇함. ㅋㅋㅋ* → Humm... *Z-연이 is very delighted. 온 썬데이, 아이 앰 고잉 투 겟 마이 폰, → On Sunday, I am going to get my phone, 앤드 메이비 마이 수윔수트. ㅋㅋㅋ → and maybe my swimsuit. kkk 유 노우.....비키니? 아이 돈 노우, → You know bikini? I don' know, 벗 아이 앰 씩 → But I am sick (푸하하하하하하하하하하하하!!! 야~ 짱이데, 이거? 씩...크하!!!) → (hahahahah wow~great, this? sick...kkhaha!!) 어브 원피스 수윔수트;;;;;;;; → of one-piece swimsuit;;; 하하하하 벗 마이 맘 이즈 비잉 어 비치 라이트 나우 → haha But my mom is being a @ @ now 앤드 이즈 트레트닝 미 (.....?!) → and is @ me (...?!) 윗 퍼브릭 스쿨. ㅠㅠ 무슨.....고통 체임버??? -,- → What public school.ㅠㅠ What....pain chamber???-,- 쉐 이즈 새잉 댓 → She is saying that 이프 아임 앰 낫 씨리어스 어바웃 스쿨 → if I am not serious about school (;;;;;;라이트, 커즈 아이 브링 배드 리포트 카드......노우!!!!! grr....) → (;;;;;;right, cause I bring bad report card......no!!!! gee....) 쉐 웰 테이크 미 아웃 어브 스무. WTF????? → She will take me out of @. WTF????? 쉬 이즈 어 머더퍼킹 애스홀, 아이 노우. -.-;;;;;;;;;;;; → She is a @ @, I know. -.-;;;;;;;;;; 애니 웨이즈, 아이 러부유 소우소우 마치, 앤드 콜 미 베이브!!!! ^^ → Anyway, I love you so much, and call me baby!!!^^ &lt;3 ~매씨~ → ~@~ (아이씨..................ㅠㅠ 이름이 이게 뭐냐궁~~?????!!!!! → (@..........ㅠㅠ what is this name~??!! ㄱ- 뭐야, 무슨....바퀴벌레같은 소리.....-,-) → ㄱ- what, what....sound like cockroach....-,-)