On the day of the broadcast go to Vote> Show! Music Core tab will show 'expected' before opening time.
Once Show! Music Core broadcast starts (Weekly on Saturday 15:25 KST~), you can participate in live voting.
Please note that due to live broadcast delays and score tabulation times, voting closes before the broadcast ends.
After the voting closes, you can no longer participate in voting, and it will show 'Ended.'