Signing in for Eighteen Years: the Empress Pulled the Grass from My Grave

Fantasy + single female protagonist + time travel + system Traveling to the fantasy world, Tang Yan obtained the sign-in system. Sign in for one day, increase your life span by one day, and store it in the grave grass. He decided to sign for a million years first and then shock the world. Suddenly, one day. Bite! Host, the grass on your grave has been pulled away! Tang Yan: Damn it, damn it, my life! ! ! ! That woman, don't let me find you. If I find you, I'll...