From a strictly grammatical point of view, only really soon is correct because real is originally an adjective. In informal style and spoken English real is used as an adverb but it's a good idea to avoid expressions like real good in serious writing. CB
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dimsumexpressReally soon - As explained by CB is technically correct, but sounded like a out-of-tune piano in this sentence (to these ears anyway).There are different ears! To my ear, a out-of-tune piano sounds like an out-of-tune piano whereas really soonsounds really good!