are you trying to say that it's a secret. secret. really? sorry -- Anyway, if you want to say 비밀입니다(formal) then it should be 죄송합니다 or 미안합니다. if you don't have to be formal(like when you talk to your friends) you can just say 그건 비밀이야. 정말 미안 or 미안해. so it depends who you are talking to.
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