David is smiling at the crowds of zombies who try to climb the spiky barricade. They defeat them in numbers but not in brains. Wilson reports their situation, so far there's no sign of the twins' arrival. They also fortify their defenses with equipment, David has yet to be satisfied with the number of efforts the rebellion soldiers have tried.
He's complaining that it's not enough, they need to add more to protect Luna. David's younger sister calms him down, telling him that they already did their best. Seeing how kind Luna is, he decides to mask his dissatisfaction, he loiters around Luna's side. Being an overprotective brother he is, he also gazes at Tae Min who sticks too close with Luna.
"Don't lay your hands on my sister" David snarls at him. "She's still my little sister! Don't touch her with your filthy hands".
"Chill, I'm not planning to make a move on her" Tae Min sighs. "You need to learn how to stay calm leader".