Prologue episode/ tutorial episode question

by Prissydixie posted Dec 01, 2016
When does this episode take place? I assume its how Ji Hoon escaped? Although it also shows him being captured again if i remember correctly.
So are we going to see a continuation of the episode or a flashback about it or something in the near future? Ive been wondering what happened to Ji Hoon since that episode and even now we still dont know :/
Super excited for the rest of season 2 though :D