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I'm looking for a manhwa about an uncle going back in time to when his brother-in-law left his niece and move to another country right before her death in her finding out what level of power she has. This is set in a time where they have powers and battle each country. So his brother-in-law left the country and left them this huge building.
At the end of page 7 was a transitional scene. When it faded to black gray it was transitioning into the present.