I can rewind time to prevent death - Chapter 793 - 450: The Stronger the Change

[House of Dragons, Game of Thrones Prequel] The heir prince known as the One-Day Heir should have died young, but Rhaegar stubbornly survived.Being born sick and weak cannot defeat him, and losing his qualification as an heir cannot make him give up on himself.Using the Explorer system, he will explore ancient relics and embark on a legendary conquest that will span the Seven Kingdoms.Explore the Skull of the Dark Terror Balerion: Dragon’s Legacy (50% Fire Resistance)Explore the White Hart: A desire for LongevityExplore Blackfire and Dark Sister: King’s Gaze and Knight’s Oath.Rhaegar tamed his dragon, took the Iron Throne, and destroyed all who stood in his way.Winter is coming, and I have ridden my dragon to meet it.*Important Note*In the original narrative (Lore), the one day heir prince was named Baelon, in honor of Viserys’s father.However, the author, disliking the name Baelon, opted for Rhaegar, inspired by the Prince Rhaegar in Game of Thrones.

In a world shadowed by death, the silent realms await, home to the undead and the Grim Reaper's sanctuary. As long as death's presence endures, the great Undead Queen will return.

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

To pass as an imperial concubine, one must be professional.

Actually, the profession of an imperial concubine is pretty good. The emperor will accompany you in eating and drinking, and even pay you for it. What’s not good about that?