Gi-hun and the rest had thought it'd be a good idea to try to capture their capturer. They went out with guns but eventually ran out of ammo they soon came to the realization that the guards they had killed had more ammo in their pockets. Hyun-ju had offered to go back to the dorm to get the ammo in the soldiers pockets but Dae-ho insisted on going instead

The overwhelming anxiety and seeing a guard's corpse on the way back had triggered his PTSD

Hyun-ju: ( yelling ) Dae-ho! Dae-ho! Dae-ho, where are you? She yelled as she ran into the main room

Has anyone seen Dae... Dae-ho! Dae-ho. Someone pointed to Dae-ho, who had made himself little in a corner, underneath the beds

Dae-ho gasped

Hyun-ju: What's going on?

Dae-ho: I'm sorry.

I'm sorry.

Hyun-ju: Where are they?

Dae-ho: Forgive me.

I'm so sorry.

I'm sorry... He whimpered, as he flinched , thinking Hyun-ju will hit him

Dae-ho: I'm sorry.

I'm sorry.

I'm sorry.

Hyun-ju grabbed the ammo and just as she was about to leave, guards walked in, telling everyone to get "face down"