World-Saving is a Skill

세상도 구해본 놈이 잘 구한다 • A Hero Who Knows His Stuff • The One Who Saved a World Before Will Be Best at Saving Another • The Return of the World Savior

I saved another world... only to find Earth in an even bigger mess. However, there's no need to worry. A guy who saved the world once can do it again.