Faithfulness, pronounced as xìn yì, Biography of the Three Kingdoms, Shu Zhi and Zhuge Liang: "The general is the emperor's palace, loyal to the four seas, commanding heroes, and thinking of sages like thirst."

Faith is also a drama, directed by Jong-hak Kim, written by Ji na Song and starred by Lee MinHo, Kim Hee Seon, Liu Wuxing and Li Bili. The drama mainly tells the story of Cui Ying, a warrior in the Korean era, and Eun-soo, a modern female doctor, who traveled through time and space to create a wise king who ruled the whole world. The play premiered on August 3, 20 12 on SBS TV in South Korea.

Although the story frame of the play is based on the time-travel drama, the historical elements still occupy an important position. The background of the Koryo dynasty and the general played by Lee MinHo all depend on the real history. For Jong-hak Kim, a director who is good at shooting historical dramas, he combines the elements of ancient official history with unconstrained style, plus the rich imagination of screenwriter Ji Songna.

This drama is more than a simple time-travel drama. It can be seen from the characters in the first four episodes that the director vowed to make it a costume drama with magical and mythical colors. The auditions and fire shows that have appeared in the play can use sound and flame respectively. Cui Ying can launch Lei Gong with one shot, and the secret special forces "Red Crescent Team" is even more talented.