At the end of hardship comes happiness.

고생 끝에 낙이 온다 - Go-saeng kkeut-e nag-i on-da

Literal translation: At the end of hardship comes happiness.
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For the girl who made this hardship of life worth living, I wish you a happy birthday.
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Kang Sae-byeok and her brother are surprised by her girlfriend, Ji-yeong, when she reveals three tickets to Jeju Island, despite how little they would ever be able to afford it. But sometimes even the pursuit of money can be shove aside whenever you can spend quality time with a family you can call your own.