A Certain Knowledgeable Wiki [Code Vader/Unknown Actor] (Wiki)

Su-Jin Kyung Mi

Sometime as Kyung Mi expressed it she use to be very kind to Tedashii Hamasaki, Kuroyoru Umdori and the rest of the Agency Education Department child errors. But lost her patience's and even expressed how troublesome it was to save yen. And proudly boasted to be a reason to change.

Relationships

Tedashii Hamasaki
It is suggested that Kyung Mi is Tedashii Hamasaki's first adult guardian that raise him. She seemly understands him to a level of being capable to easily taunt him, encourage him, and insult him. Whichever reason in doing so. She knows what he truly wants and desires to help him despite other adults not agreeing with her style of methods. Tedashii showed to be very comfortable disrespecting her despite her tyrant behavior towards him this could indicate that he and the other child errors doesn't take her tyrant persona seriously.
It was also suggested by herself that Kyung Mi use to be nice to Tedashii and the other Agency Education Department child errors. But lost her patience with the delinquent's spoiled demands, their lack of self care, and troublesome schemes and pranks, and eventually rebel becoming a tyrant landlord.
As the prequel story is "ongoing" not too much major has been confirmed from the relationship. ("TBC (will be Updated soon)")

Kuroyoru Umdori
It is unknown whether time Kyung Mi had Kuroyoru sense the very beginning of her life or years prior to the main events of its prequel storyline, however it's applied they've been together long enough for it to be easy for Kyung Mi to seemly understands her to a level of being capable to easily taunt her, encourage her, and insult her. She can even make Kuroyoru cry easily.
As the prequel story is "ongoing" not too much major has been confirmed from the relationship. ("TBC (will be Updated soon)")
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Chronology

Background

It's hinted suggested that Kyung Mi took in and raise Tedashii Hamasaki, years prior to the prequel story, since Tedashii confirms in chapter 5 Vol 1 to have never met his parents or at least don't remember their faces. It is highly suggested that she is Tedashii Hamasaki's first guardian figure.
It was also suggested by herself that Kyung Mi use to be nice to Tedashii and the other Agency Education Department child errors. But lost her patience with the delinquent's spoiled demands, their lack of self care, and troublesome schemes and pranks, and eventually rebel becoming a tyrant landlord. (Thought as the conversation's applied the child errors don't seem to necessarily see her as a tyrant threat, as she gets ran all over through the chaotic kids shenanigans.

(A Certain Scientific Code Vader)
Tedashii Past Saga Arc
Kyung Mi first appears picking Tedashii Hamasaki and Kuroyoru Umdori belling them from anti-skill office after the two have been arrested for stealing the UVA HERO III drone, destruction of public property, and resisting arrest. Kyung Mi should great frustration observing Tedashii and Kuroyoru lack of care to the consequences to their actions. Isamu would then witness Kyung Mi's abusive behavior towards the delinquents and lecturers her, but soon would be interpreted by the Shiga urban legend ritual that Tedashii and Kuroyoru performed upon him.

Kyung Mi would frantically explain that her cruelty towards the delinquents is due to their unreasonable behavior. And that it's for the upmost best for them to encourage them to find a better home if she rightfully do so, to prevent them from becoming to comfortable. She even expressed how much yen she saved in rightfully so. To which Isamu would assist Kyung Mi shouldn't be proud of her current actions.

Later Kyung Mi would take her to her parking spot and complain about doing this so often and how much of a waste of yen it's been doing so. Due to Tedashii and Kuroyoru lack of care, Kyung Mi becomes violent beating the delinquents in broad daylight before stopping herself after being witnessed.

After calming down Kyung Mi admits to the two delinquents that they probably would never be adopted at this point and presumably prepare for the case of being stuck with her forever. As she gets on her car, Kyung Mi kept the doors locked to and as punishment assist Tedashii and Kuroyoru walk home. Tedashii question this method as an actual punishment to which if they don't hurry the new orphan and other child errors mainly Yuzuriha Ringo would eat tonight's possibility leaving the two to starve. As Tedashii and Kuroyoru faces blooms pale Kyung Mi takes off at the green light.

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Quotes

[Kyung Mi's mistreatment to Tedashii after exposing himself to her white lie (Code Vader chapter 28(part2))]: "What good is all that intelligence when stuck behind a useless brat with no common sense? Damn it all! I'm never going to get rid of you useless brats."

[Ibid: explaining to Isamu, her excuse towards her mistreatment to the Agency Education Department child errors (Code Vader Chapter 28(Part2))]: "Can't you see Isamu Akihiro. I've tried playing the unforgettable lovable supporting character whose affection brings a bright setting in the youngsters origin story. But it cost too much! These brats always want something from the store, they always break something, and no matter how you treat them there's always something. That's when I realized how much money I can save by being a tyrant. That will make these little shits try harder to get themselves adopted."

[Ibid to Tedashii (Code Vader Chapter 28(part2))]: "Oh look at the next upcoming HeRO BoY! Little people know, I'm the actual real superhero that saves the supervillains at the end of the show!"

[Ibid to Tedashii on growing up due to idealistic preparing for him to never be adopted. (Code Vader Chapter 28(part2))]: "It means, you're gonna have to step it up! Stop being such a pitiful role model and use that big nifty head of yours. Use that power for someone else for a change instead of yourself."

[Kyung Mi to Kuroyoru Umdori about preparing to grow up alongside Tedashii (Code Vader Chapter 28(part2))]: "Kuroyoru! You know this idiot tries too hard to vertically progress to the next level. Horizontal damage control! Make sure he has his head aiming straight for the prize."

Design
Kyung Mi was designed to be seductively attractive, and mature looking opposite to her true personality. She originally was not assigned to have a character sheet but due to the first art piece not showcasing and clearly depiction to use for the wiki, and her relevance, Z decided to have Revi-Arts perform an official character sheet.

Kyung Mi official design by Code Vader III artist Revi Arts.