I'd say.... "정말 잘했어. 네가 자랑스러워" (informal and not polite) "정말 잘했어요. 당신이 자랑스러워요"(informal and polite) \^o^/

잘 찰했어요.= you have done great job. im proud of you. even i dont know waiting someone to answer it. 저도 몰라요.