The second season of the Vietnamese television mystery music game show Hidden Voices premiered on HTV7 on 7 October 2017.
Under the "battle format", two opposing guest artists eliminate one singer each during the proper game phase, and then remain one singer each to join the final performance. At the end of a game, the following conditions for winning mystery singers chosen by opposing guest artists, depending on the outcome of final performances, if:
If the last remaining mystery singer is good, the guest artist wins ; in case of a tie, the same prize money is split, receiving each. Both winning mystery singers, regardless of being good or bad, get each.
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