If I Marry the Empress at the Beginning, I Will Be Invincible!

A person is in another world and starts to marry the empress. This book is also called "The Rebirth of the Empress: Hold My Thigh at the Beginning" Martial arts: Great master cultivation level at the beginning! The empress is busy attending court, so it makes sense for me to marry her junior sister. Fantasy: I'm invincible at the beginning, I'll listen to the music ………… [Fantasy + imagination + single female protagonist + time travel + rebirth + invincibility + system]