Return to the City, Lord Demon

A hundred years ago, alien worlds invaded, and humans resisted bravely. Today, a hundred years later, humans have crossed into a new era, and all kinds of strange people with extraordinary abilities are like crucian carp crossing the river, constantly emerging on the continent. A phone call and a favor that she once owed made the protagonist Su Jin inexplicably become the personal bodyguard of the eldest lady of the Li family. I thought this was just an ordinary mission, but I didn't expect that there was a shocking secret hidden in it. People from other worlds want to capture her, enemies want to capture her, even mysterious organizations want to capture her... All of this began to make Su Jin feel interesting. "There are only people in this world that I, Su Jin, don't want to protect, and there is no one that I, Su Jin, can't protect!" Some heroic words officially kicked off the life of Su Jin, a monster...