On the day when the apocalypse came, the ten-year-old Nineteen climbed out of the ruins of the orphanage holding a spear.
She has no superpowers, so she relies on her brains and luck to meet the sister of the city's founding captain.
Later, she picked teammates from the refugees, formed a team, and eliminated mutant beasts. She still guarded the city after her sister left.
Until the fifth year, a man from another world fell in front of her without any warning.
He disappeared without a trace for another five years before reappearing with secrets and power.
From resisting her approach, to physiologically sinking into the ultimate lingering love, to being willing to block a fatal blow for her, he loved her madly and deeply.
But there is no destiny in the apocalypse and other worlds, they are just partings one after another.
The team dispersed, the city grew old, some went crazy, and some did not return.
And she will eventually walk away with scars all over her body.
Purpose: On the ruins of the apocalypse, witness the rise of an ordinary person, a love and hate that spans time and space, and a group of people's fateful elegies about protection and separation.