A time-traveler who relies on someone else meets an ambitious prince. For the desire for power, he can sacrifice his childhood sweetheart and his closest relatives. She just wants an ordinary life. When she faces calculations one after another and gradually realizes the conspiracy, how can she break free and how can she cut off her love with a sword? Looking back suddenly, after all the changes in the world, everything in my hands is no longer the happiness I expected. When the wild goose returns, where will it go to the west?