Khun Hachuling

Hachuling (하츨링, Hahcheulling, Hachling, "Hachuling") is a Ranker, a defected member of the Koon Family, and one of Koon Aguero Agnis' older brothers. He may be biologically related to Aguero but they don't share the same mother.

He is a member of the Wolhaiksong, a non-government organization

Appearance & Personality
Similar to other members of the Koon family, he appears to have short blue hair and blue eyes.

Powers & Abilities
Hacking: He is great at hacking. During the Workshop Battle he was able to hack the Archimedes and seen hacking into Koon's Lighthouse with some kind of gaming console. Take note that hacking into a Lighthouse is unlikely a Scout ability, but the ability of someone very good with technology.

History
Hachuling claims that since joining Wolhaiksong, he has separated himself from his birth family.

Tower of God: Part 1
Hachuling and other members of Wolhaiksong travel with Yuri to The Floor of Tests to secretly retrieve the Black March. During the Last Examination arc, he hacks into Koon's lighthouses to find his friends scattered through the second floor.

The Suspicious Arcade
In Part II, he has shown up as an owner of an arcade located on the 77th Floor. After betting Quant out of all his money through games, Lero-Ro challenges him after finding out his identity. But he is interrupted by a call from Yuje. He decides hire to Lero-Ro and Quant as 'interns' to conduct some work he was initially assigned by Yuje during the call under the premise that he'd take them to Wolhaiksong should they succeed.

Closure
Lero-Ro mentions having a teammate onboard Archimedes, whom is skilled in hacking and plans to hack into the well at the participant waiting area and summon the teammates of Koon, Viole and Leesoo to their suspendiship. This skilled hacker of course, turns out to be Hachuling who previously received a mission from Yuje to watch over the new Slayer Candidate. He also hacks into the cameras on Archimedes and the arena, putting the shameful deeds of FUG on broadcast that was prevented because of Po Bidau Gustang's intervention

Epilogue
Hachuling, Lero-Ro, and Quant have a discussion regarding the aftermath of the Workshop Battle, realizing that everything may have gone according to the plans of someone higher up as the broadcast failed to go through. Hachuling then suspects the possibility of it being for the sake of keeping the Slayer Candidate safe. He claims to have been to the Hidden Floor in the past when Quant brings up the Hell Express,

Notes and Trivia

 * Although fans originally speculated that he was a Light Bearer seeing how he hacked into Koon's Lighthouse, SIU has stated that he is actually a Scout, and it can be assumed the hacking is simply a skill he utilizes against enemy Light Bearers.
 * It is debated whether he is a Ranker or a High Ranker. Although it is not explicitly stated, one could be lenient to the concept of High Rankership since he is a member of Wolhaiksong.