"(hwanhee(환희 ) oppa Sahar(ME사할 ) tells you (happy birthday) i love you so much.
my birthday is also soon its same with kogyeol's(고결 ) birthday wow)"
It's a little unclear which part is the exact speech. Anyway, I think it should go like this.
(환희 오빠 사하르)인 내가 네게 (생일 축하해)라고 말하고 너를 무척 사랑해.
내 생일도 곧 돌아오고 고결이도 마찬가지야, 와.