It happened on scavenging for supplies. While you were running from the sphere because you were out of ammo, you tripped over a rock and fell, sliding your knees on the asphalt. You covered yourself with your hands, thinking that you were about to die, but someone shot at the sphere, saving you.
Raising your head, you realized it was Bora. She helped you up and, standing on your feet, you limped back to your shelter with other ones who were also helping with searching for supplies. Today Young-shin was on surveillance, so when your group came back, he immediately came to check on all of you. When he saw your a little bloody knees, he looked up at you with worried expression. You meanwhile looked at the floor.
When everyone went to rest, you were sitting next to Young-shin. You rolled up your pant legs and your knees were completely scraped. Yong-shin had taken it upon himself to help you, so he was now kneeling in front of you, treating your wounds while you hissed and clutched the fabric of your pants tightly around your thighs.
Young-shin: Sttt, it's okay, I'm almost done..