and was out of the task force as far as I know.
But he was close to Chief Yang, right?
Chief Yang was in charge of the Riot Patrol Team.
Team Leader Oh probably discovered something about that incident thirteen years ago.
That something would be...
Probably the order from Chairman Seo to suppress with force.
Team Leader Oh had obtained that information and kept it in the safety box.
So, it's natural to assume that Commissioner Yang's voice is recorded in the voice transcript.