‘Moon Lovers: Scarlet Heart Ryeo’ episode 13 spoilers, promo revealed: Wang Wook and Wang So fight a decisive duel; Who will become the king? [VIDEO]

"Moon Lovers: Scarlet Heart Ryeo" episode 13 debuts Oct. 4 and it will see Wang Wook (Kang Ha-nuel) and Wang So (Lee Joon-gi) come face to face for a decisive duel for the throne. Meanwhile, Wang Wook confronts Hae Soo (Lee Ji-eun). Here are the detailed spoilers for the next chapter of the series. Read on to find out what happens next.

[Spoiler alert! This article contains spoilers for "Moon Lovers: Scarlet Heart Ryeo" episode 13. Do not read further if you don't wish to know more about it.]

In episode 12, King Taejo orders Wang Wook and Wang So to go to China as an ambassador. Meanwhile, he promises Wang So that he will let Hae Soo work in the palace but does not keep it. He orders to send her away. Hae Soo pays one last visit to Wang So as they both prepare to leave the palace. It is then, So pulls her closer and kisses her.  

Wook is devastated when he finds out Soo left the palace. A year passes. Wang Yo is looking to become the king. Meanwhile, Hae Soo is working as a water maid. Wang Wook meets Hae Soo and apologises for abandoning her. As for So, he returned from Jin and pays a visit to Hae Soo. He informs her that he missed her. In the meantime, an evil plan to kill the king comes at play during a celebration in the ceremony. However, Baek-ah takes the sword and dies.  

Moving on to "Moon Lovers: Scarlet Heart Ryeo" episode 13. Not many details for the upcoming episode are available. However, a promo video teases the events of the next chapter. Fans must brace themselves for an intense episode and an epic duel between Wang Wook and Wang So.

As ailing king's health deteriorates, the search for the next king is on. Both, Wang Wook and Wang So are determined to take the throne and they get down the battle ground for a duel. Meanwhile, Wang Yo is up to something. His sly smile suggests a sinister plan in the play. Scroll down to watch the promo online.

"Moon Lovers: Scarlet Heart Ryeo" episode 13 airs Oct. 4 at 10:00 pm KST. Stay tuned for more spoilers and updates.