Cha Yoon-seo	어떻게 이렇게 갑자기 출혈이 멈출 수 있죠? How could the bleeding stop so suddenly like this?
Kim Do-han	글쎄. I don’t know. 이유는 아무도 모르지. No one knows the reason.
Park Shi-on	인해야, 보고 싶었어. 너 웃는 거. In-hae, I wanted to see you smile.
Cha Yoon-seo	고생했어. 인해야. You did great, In-hae.

고생했어 (You did great / Good job)

고생 – hardship, trouble, suffering
하다 – to do
~했어 – casual past tense statement form of [하다]

Casual – 고생했어
Semi-polite – 고생했어요
Polite – 고생하셨어요 / 고생하셨습니다

>> used to acknowledge someone’s hardship or hard work

>> sometimes used as an end-of-the-day goodbye to co-workers

>> similar to [수고했어/수고했어요/수고하셨습니다], when used to comment on hard work