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Gil Mu Jin is a member of Deung Ha Bul Myung until the completion of its primary mission in reclaiming the throne. Formerly serving as captain of the King's guard during King Jin Hyul's reign, he later presumably serves as captain of the reinstated Bi Yeong Ship Mu under King Jin Jeok.


Mu Jin is a former member of Bi Yeong Ship Mu during King Jin Hyul's reign, where he was a close comrade of Baek Yoo Shin and quite possibly Baek Ho. Being such, he and Yoo Shin usually trained together and honed their swordsmanship skills, always leaving Mu Jin victorious in the end. Moreover, though it is unknown whether Mu Jin wanted it himself, Yoo Shin occasionally voiced out his vision of becoming Bi Yeong Ship Mu's captain someday. Later, despite their friendship, Yoo Shin saw Mu Jin as a rival to the point of becoming envious of his achievement, most possibly after Mu Jin became the captain of King Jin Hyul's royal guard.

Jeogwa RevolutionEdit

Main article: Jeogwa Revolution
31 4

Mu Jin survives the palace fire

Subsequently, during the Jeogwa Revolution, Yoo Shin succeeded Mu Jin as and finally achieved his dream of becoming captain of the King's guard, the newly formed Bi Yeong Pal Mu. Yoo Shin believed from then on that Mu Jin died in the palace fire that was caused by Yoo Ja Gyeom.[1] Unknown to him, Mu Jin survived the fire and escaped the palace that night. It can also be hinted this was when he lost his right arm.

Some time after the coup d'état, Mu Jin sided with Crown Prince Yi Jeok and Yi Hwi, who were safely hidden by Wol Young Hwa of Yu Hyang Ru as per Left Minister Seo In Seon Woo's intervention. Mu Jin managed to gather intel from other parties, being able to know about the deaths of Minister Yi Ha and his wife; he later informed the group about this, even to their foster son.

From then on, Seon Woo and Young Hwa devised a plan to keep the crown prince safe from Yoon Yeon Lee, which was ultimately to make Hwi the crown prince's decoy until they reclaim the throne. Amidst initial protests from Jeok, Hwi accepts this task willingly. As Hwi took the title of crown prince, Mu Jin and Baek Ho were assigned to serve him with loyalty, Young Hwa and her daughter Seol Hwa were to keep the secret, and Jeok was to serve Hwi as his liege.

The Deung Ha Bul Myung rebel army was founded later on, establishing their headquarters in Bi Hwa Rim near the palace itself. At some point, Mu Jin taught Hwi his signature swordsmanship of decimating the skin and the underlying organs beneath normal-looking wounds. The Crimson Moon mastered this skill and utilized it during missions.


Fateful Encounter Arc Edit

On the night of Ga Guk's festival, Mu Jin escorts Nabi along the streets of Hyang Ju. As the fight ensues between Yi Won and Nam Yang Heon with his subordinates, Mu Jin watches from afar and plans to help Won in fighting them as hinted by Nabi, but he finds no more need as Won was able to beat them up alone.[2]

Compact Heist Arc Edit

Mu Jin attends the evening rendezvous with some members of Deung Ha Bul Myung including Nabi, Wol Young Hwa, Yi Jeok, Baek Ho, and Seo In Seon Woo regarding the compact. As Nabi volunteers to go steal the compact, he tries to refute along with Baek Ho but agrees thereafter. He is also shocked at Jeok's volunteer and seemingly cannot contest his decision like Nabi. He then ends up being part of the group tasked to find the missing Inspector General along with Baek Ho. In the end, they are unable to find him.[3]

Chase Arc Edit

On the night when Yi Hwi, together with Yoo Dan Ah and Won, was chased by the villagers of the slums, Mu Jin strolls with Hwi and Jeok in Bi Hwa Rim. Hwi surprisingly notices Dan Ah wandering around and goes to her, while he and Jeok hide in the trees. As Hwi tends to Dan Ah's injury, he and Jeok leave a pair of plain shoes for Dan Ah's use.[4]

Plague Arc Edit

One late night, as Nabi strolls to Yu Hyang Ru from Dan Ah's residence, she is confronted by Jang Rok Ha and is worried that she is unaccompanied. Nabi reassures him that she is in fact accompanied by Mu Jin, who seemingly follows her from the shadows. He then accompanies her back to Yu Hyang Ru.[1]

32 4

Mu Jin and Hwi secretly plan to help the plague patients

During the plague outbreak at Moon's End Village, Mu Jin meets with Hwi from a mission in helping the people of the plague-stricken land, giving grain and medicine. He is instructed by Hwi to return to Yu Hyand Ru instantly to sell Nabi's valuables in exchange for money, while he will pursue the fake Crimson Moon. He also orders Mu Jin to keep his individual mission as a secret between the two of them, to which Mu Jin agrees.[5]

After finishing his task, Mu Jin rendezvouses with Hwi at Moon's End Village. He informs Hwi that the medicines were all unavailable, possibly due to the royal court procuring some in case the plague reaches the capital, much to Hwi's dismay.[6] By nighttime, Hwi asks for Mu Jin's help in searching for Dan Ah and Won, who have both gone missing. Under the pouring rain, Mu Jin looks for the two, but to no avail. As he reports this to Hwi, the latter asks him to further scour the entire village to look for them.[7]

Rebel Army Suppression: Setting in Motion Edit

Mu Jin continues to plan secretly with Hwi regarding helping the plague patients. During their secret meeting, however, an angry Jeok and Baek Ho infiltrate the room, revealing their secret. Jeok reprimands Hwi once again, but agrees to help him nonetheless for the last time, planning for a midnight infiltration at the palace to retrieve some medicine for the plague patients.[8]

Rebel Army Suppression: Execution Edit

As Mu Jin and his team arrive at the palace, they later find out that the medicine is gone. At that point, they also find that Bi Hwa Rim is under fire.[9] As Hwi rushes to Yu Hyang Ru, they immediately secure an escape route for the remaining survivors at the gisaeng house.[10]

Bridal Selection Arc Edit

Mu Jin finds Hwi's letter

Mu Jin rushes to Jeok and tells him about Hwi's letter

At the rebel army's interim headquarters few days after the attacks, Mu Jin rushes to Jeok and tells him and Baek Ho that Hwi has left a letter behind. As Jeok reads the letter, he rushes to find Hwi, while Mu Jin and Baek Ho follow him cluelessly. In reality, Hwi has decided to pose as Nabi, now Dan Ah's maidservant, in order to enter the palace for the bridal selection. They come across the palanquin near the palace entrance where they spot Nabi in the procession as Dan Ah's companion. Jeok immediately orders Mu Jin to find a way to get into the palace and Baek Ho to look for that person.[11]

Trivia Edit

  • Mu Jin severs Heuk Rang's arm during their death battle, a parallel to how he lost his own arm possibly by Yoo Shin's own doing.
    • Incidentally, the events when these occurred deposed their erstwhile allegiances: Mu Jin lost his arm during the Jeogwa Revolution that deposed Crown Prince Yi Jeok from the palace, while Heuk Rang lost his arm during the Crimson Moon Rebellion that deposed King Jin Won from his throne. Moreover, these allegiances ascended to the throne as kings during respective events.


  1. 1.0 1.1 Twelve Nights webtoon, chapter 31
  2. Twelve Nights webtoon, chapter 1
  3. Twelve Nights webtoon, chapter 8
  4. Twelve Nights webtoon, chapter 17
  5. Twelve Nights webtoon, chapter 32
  6. Twelve Nights webtoon, chapter 35
  7. Twelve Nights webtoon, chapter 36
  8. Twelve Nights webtoon, chapter 39
  9. Twelve Nights webtoon, chapter 43
  10. Twelve Nights webtoon, chapter 44
  11. Twelve Nights webtoon, part two final chapter


Characters of Twelve Nights
Ga Guk
Royal Family Ahn YoungHyun BinJin HyulJin JeokJin WonUnnamed Baby PrinceUnnamed Baby PrincessYi HwiYi Sae GiYoon Yeon Lee
Ministers Hwang Se HyungKim Hak GyuSa Hwa HyeonSeo In Seon WooWi Ji HyunYi HaYoo Ja Gyeom
Bi Yeong Pal Mu Baek AhBaek JuBaek LinBaek RyungBaek SaHeuk Rang
Bi Yeong Ship Mu Baek HoBaek Yoo ShinGil Mu JinYi Ha
Deung Ha Bul Myung Baek HoCrimson MoonGil Mu JinNabiSeol HwaSeo In Seon WooWol Young HwaYi HwiYi Jeok
Yu Hyang Ru NabiWol Young HwaYi Jeok
Others ChungHwang Se RyeonHyunMa Mi SongNam Yang HeonSoriWoonYi Ha's WifeYoo Dan AhYoo Dan Ah's Mother
Seo Seo
Royal Family First PrinceFirst PrincessJang ReiJang Rok HaJang RyunSecond PrincessThree Wives of Jang RyunUnnamed Baby PrinceUnnamed Baby PrincessYeong Bi
Others Gwak Ji RyeonMeng Gyeom
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