translate to korean/hangul! :-)
"i hope you like the presents & wishes. i hope you're happy and always smile. do remember to open the letters the three of us has wrote if you're feeling uncomfortable. i hope you enjoy this year's birthday."

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Answer

선물과 카드 다 마음에 들었으면 좋겠어.  항상 행복하고 미소 짓기를 바랄게. 만약 지금 좀 불편하다면 우리 셋이 쓴 편지 읽는거 꼭 기억해! 올해 생일 즐겁게 지내길 바랄게.

음.. 대강 해석은 했는데  더 좋은 표현이 있다면 바꿔주세요:) 
I translated your text roughly and rather directly.. I would feel a bit more comfortable if others can put their cents in!!

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