Returning Three Years After Faking Death, the Tyrant Turned Dark (64 episodes) - AllShorts

Song Yi accidentally transmigrated into a book, becoming the only woman by the tyrant's side. The system assigned her a mission: to thoroughly become the irreplaceable white moonlight in the tyrant's heart. Song Yi taught him joy, anger, love, and longing, making him truly understand what it feels like to love someone. Once the task was complete, she returned to the modern world without hesitation. Over the next three years, she thrived in the modern world. Yet one day, she awoke to find the world distorting before her eyes—and was dragged back into the book's world once more.

Returning Three Years After Faking Death, the Tyrant Turned Dark - 1