Betrothed by his beloved, scholar Sung Yeol unexpectedly joins the undead. Now he must track down the one diary that will destroy Gwi, a bloodthristy vampire determined to rule the human world.

In the midst of Sung Yeol's search for the lost diary, he discovers that the people are beginning to question the prince's death that took place a decade ago.

While Yang Sun insists on helping Sung Yeol track down the journal, Crown Prince Lee Yoon continues to hunt down all those who defy the crown.

The search for Forbidden Quest heats up, as talk of the sequel attracts more attention. With Prince Sadong's memorial approaching, living in hiding becomes more difficult for Gwi.

As Gwi continues to look for the manuscript, Sung Yeol struggles with how his growing feelings for Yang Sun strike his desire to live as a human.

Yang Sun is reluctant to leave when Sung Yeol sends her away. The king discovers the identity of Forbidden Quest.

Gwi uses innocent people to try and draw out Forbidden Quest, which spurs Sung Yeol to come out of hiding.

Sung Yeol is determined to use the people's sentiment to turn the tide against Gwi. The king hands over the search for Forbidden Quest to the Crown Prince.

Accused of being Forbidden Quest, Yang Sun and her father are imprisoned for treason. Realizing that Yang Sun's life is in danger, Sung Yeol decides to face Gwi.

While Sung Yeol thinks of a way to rescue Yang Sun who is now a palace slave, Crown Prince Lee Yoon does an about face to his ideals as Forbidden Quest.

A potential alliance between Sung Yeol and the Crown Prince is threatened when a hunter's appearance comes between them.

In the final preparations in the fight against Gwi, the king learns of the three crucial clues needed to take down his sworn enemy.

With the prince pushed ahead to lead the fight, Sung Yeol is alarmed when he finds out how much he must sacrifice when it comes to defeating Gwi.

Greatly weakened by being unable to feed, Sung Yeol desperately tries to prevent Yang Sun from being captured.

Sung Yeol and Yang Sun remain in hiding while Lee Yoon continues his fight against Gwi, who is becoming increasingly impatient with each passing day.

Now having learned the truth about the secret keys to destroying Gwi, Sung Yeol must rescue Yang Sun before it is too late.

Everyone is taken aback when a new side of Sung Yeol unexpectedly appears. Will Sung Yeol be able to fight his instincts or succumb to his cravings?

As Gwi assumes power in the kingdom, Sung Yeol feels that the future is bleak, and is encouraged to have faith in humanity.

Gwi decides to bait Lee Yoong into returning to the place. Sung Yeol and the others try to come up with an alternative plan to destroy Gwi.

While making preparations for the last stand against Gwi, everyone involved must be prepared for whatever the outcome is.