I can hear your voice

it was in the year of 2010 , when bangchan heard it while having his first training in the peak of sunrise.
the voice wasnt someone he knew , but he shut up and went on.
time flyes by and events happened.finally in the year 2017 , it was finally the day he could debute with his group of 8, him being the ninth and the leader.
he looked at his team with a happy glance but suddenly felt his head going dizzy. he excused himself and went into a room.for a breif second he recognized the voice.the same exact words.
finally he had the thought
.....
"who is this voice?"