Spoiler!
Shin haechang sees that boys hunter application and accepts it. The boy soon receives the acceptance email and is ecstatic. Hyoseop warns him not to use or mention his name - "jin" as someone could recognise him. The boy agrees and is then off on his way to the NSA in Korea. Again I'll skip some time and at some point the boy mentions jin by mistake either by saying his name or mentioning a handsome Korean guide that helped him. Shin catches on and thinks hyoseop is in baños. To be sure he tells his secretary or wtv to open a portal and meet hyoseop. And coincidentally hyoseop was gonna go to Korea to guide adante. Also an irregular or large gate appeared near equdor so some locals evacuated to korea cuz there was a portal, and some stayed. And thats basically what happened and what the manhwa didnt mention. After that begins hyoseops NSA arc which I won't spoil yet.. maybe....
HOPE THIS HELPS YALL!!
ദ്ദി(˵ •̀ ᴗ - ˵ ) ✧