i. it's the end of the world, and i'm not prepared

Alex and Julie were an inseparable pair of best friends who had both planned on going to college for music...

That is until the sun's core started to heat up and began killing plants and humans.

This of course caused panic to spread throughout the world, especially to Julie and Alex, but all hope wasn't lost when Alex and Julie's families received a letter saying they had been chosen to live in an underground bunker.

The problem with that was, there was only enough food to last the lot of them a year.

When the year passes and they run out of their rations, everyone loses hope.. That is until Julie hears a knock on the bunker's hatch.

(based on the 100 but you don't have to have watched that to understand)