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In past life, MC was discriminated against and ultimately betrayed by American. Regressed to level 2 and when Korea still existed. His brother in law moved to Japan and left his daughter (MC niece) behind. MC gathers martial power, divine power, and even has a second class in order to protect his niece as well as Korea (most likely gonna get revenge on his brother in law and USA)

So you are telling me the girl was already a time travelers and has tried to save the world FREAKING 3 TIMES BEFORE??!! and still failed. So, now both girl and the boy's gonna save the world.. sounds different

love it, hate the cliffhanger
i always ate up this kind of plot love them, will never get bored