An Sangeen (Kor. 안상인) is a modified human and an agent of the KSA. He is married to Na Yonsu, a fellow KSA agent and his current work partner.


Sangeen has grey hair and short black beard on his pointy chin and has ear-piercings. He maintains a collected expression on his face. He also has the habit of smoking. His attire is similar to that of a typical agent in black suit.


He is cool, calm and collected and acts when situation calls for it. He is Na Yonsu's partner and covers for her lack of foresight due to her sanguine temperament. Even though he doesn't show much emotion, he still wants to protect his country from modified humans.

He also tries to put up an act when needed and argued with Cerberus, in order to get hurt and later gets away from them to meet Tao, M-21 and Takeo. After forming a sort of alliance with them, he gets caught by Ked and Lutai and as he makes a run for it, he breaks up the contract as has no intention of involving people in unnecessary trouble.


At some point in the past, An Sangeen took part in an experiment and became a modified human along with Na Yonsu, in service of their country. This experiment was done in absolute secrecy within the KSA and all the details of it were strictly kept away from the Union. He is married to Na Yonsu and works as an agent for the KSA along with her.

Plot Overview

Volume 4


The Investigation
An Sangeen and Na Yonsu appear while investigating the big crater (created in the battle between Frankenstein and Rael) that appears in the city. Later, they are sent to Ye Ran in order to gather information on the possible KSA recruits: Shinwoo and Ikhan. During that time, their cover is blown when they place the children in danger in order to test Shinwoo's skills. It comes to the notice of the special security of Ye Ran.

Cerberus Arc

M-21 vs Na Yonsu
Sangeen accompanies Yonsu on a night charge into Ye Ran to check her suspicions on one of the special security: M-21. He stands guard on the top of the building while Yonsu searches the grounds. There he is confronted by Takeo and they engage in a short duel. However, they halt when M-21 and Yonsu stops battling and Tao arrives.
There the agents discover the identities of trio as well as having theirs discovered. Both teams come to a pact of keeping their secrets and work as an alliance against the Union.
DA-5 vs Cerberus
After the Cerberus arrives, Sangeen and Yonsu are charged with serving as their local guides. Sangeen decides to discuss with the trio regarding Cerberus and feigns an act to get hurt by the Cerberus in order to later escape and meet the trio. However, upon his return, Ked and Lutai discover the identity of An Sangeen as a modified human. He is chased by them and falls prey to their attacks. But the RK arrives to his rescue. M-21 flees taking him away from Ked and later holds off Ked to let Sangeen escape. Realizing he would only be a burden, Sangeen does as told and finds Yonsu on his way. They decide to join and help the trio, hence return to the battle field.

The 12th Elder Arc

Frankenstein vs The 12th Elder
During the confrontation against the Cerberus and the 12th Elder, Sangeen as well as Yonsu recognizes that Frankenstein and Rai as powerful beings.

Volume 5

Sangeen and Yonsu maintain co-operation with the trio, informing them every news they get from the Union. On one evening, they notice a chaos in the city alleys and inform the trio. But before either group arrive at the spot, Rai, Regis and Seira find a fleeing experiment desperately fighting his pursuers. When the KSA agents arrive, Regis has already taken care of the pursuers and the agents take the experiment to their treatment faculty as Rai seems to know the modified human. Later the trio arrives there to find that the modified human is M-24.
In the following arcs, the agents are rarely shown although their reports are frequently mentioned.

Volume 8

An Sangeen is present when Lunark visits the KSA Headquarters looking for Frankenstein.


On the process of writing the summary

On the process of writing the summary

On the process of writing the summary

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Powers & Abilities

Sangeen power

Sangeen's energy blades.

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Sangeen throws energy blades.

Physical Prowess

Being a Modified Human, An Sangeen possesses physical capabilities well beyond that of a regular human. His overall skills and abilities have been complimented by two Cerberus members. He is fast enough to keep up with Takeo who is known for his speed, fighting equally against him without much trouble (although Takeo wasn't fighting using D or boost-up pills). He has a sense for strategy, attempting to use the environment to his advantage against a stronger opponent.

Aura Manipulation

An Sangeen is able to attack using small blades made up of his aura as seen in his fight with Takeo and later against Cerberus. He can use multiple blades to attack from distance and even wield them in close combat. He shows high accuracy with these blades, being able to use them to stop all of Takeo's bullets that were aimed at him.



Rai's Group Rai · Frankenstein · M-21 · Tao · Takeo · Shinwoo · Ik-Han · Yuna · Suyi
Nobles Raskreia · The Previous Lord · Gejutel · Karias · Krasis · Kei · Ludis · Rael · Ragar · Rajak · Regis · Rozaria · Seira · Claudia · Edian · Gradeus · Ignes · Lagus · Roctis · Urokai · Zarga
Werewolves Muzaka · Maduke · Lunark · Kentas · Ashlyn · Garda · Dorant · Juraki · Grui · Gaitan· Kuharu · Mount · Drakon · Kaiyo · Gayare · Mirai · Urne · Uzhir · Gorma · Krano · Braang · Zaiga · Gaura · Gotaru · Bashum
Union Elders 1st Elder · Maduke · 3rd Elder · Roctis ·Lunark · Urokai · Zarga · 8th Elder · 9th Elder · Rostere · Muar · 12th Elder · Dr. Crombel
Union Agents & Members Dr. Aris · Bonerre · Geo · Hammer · Haydn · Ignes · Infected · Jake · Kalvin · Ked · Krantz · Lutai · Mark · Mary · Rodin · Shark · Taze · Yuizi · Yuri
KSA Lim Taesik · Sangeen · Yonsu
Others M-24
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