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

Jeong-Min

Excluding Sogiita Gunha and the school's coach, she shown to be on bad turns with all males even calling majority of them names, Tedashii exclusively, chinpoko, eventually being rumor by the Urban Hunters that she likes girls if not Gunha. Because of her negative fights she had with most of her male classmates and her feminist personality she is known by the bitch schoolgirl.

She shown to be a type of individual who enjoys being entertained by foolish embarrassment comedic scenarios. Stating Sogiita and Tedashii working together being a interesting comedy that people wouldn't see any other day.

She keeps her secret identity and investigation towards the gemstone espers, mainly reason of befriending Li Mei a secret, leaving Li Mei hanging during her Judgement tryouts. Keeping secret for so long, Jeong-Min is a pro lier.

Relationships

Li Mei Xiaodan
Li Mei is Jeong-Min best friend. Li Mei seem to tell her everything, (Though Li Mei doesn't seem all to well at keeping secrets.) Jeong-Min friendship to Li-Mei is so close that Jeong-Min instantly show negative hateful vibe towards Tedashii after learning of his name and already hearing about him making her cry. When together she refers to her as yeodongsaeng (Younger sister) though not actually related their friendship could be on the same level as sisters. However despite their positive relationship Jeong-Min is keeping her true identity as a ninja of the Oda Clan a secret going as far as taking apart of missions even dissing Li Mei in the process, however Jeong-Min honestly feel guilty of using Li Mei and promised herself that Li Mei wouldn't be harm in her goals.

Sogiita Gunha
Sogiita Gunha, is the only male of her age that Jeong-Min gets along with. She respects Sogiita defending his status after Tedashii claims he could come up with a formula to put him in check. Sogiita might be the only male character that she would give a simple high five to. However since she revealed her identity to Tedashii as a Ninja, it could only be that she's only being respectable to Gunha because she suspect he's a Gemstone esper. She also admits she "doesn't like Gunha that much," rather he's more entertaining than annoying, like the other males.

School's Coach
The school's coach is the other male to be shown on good terms with her. She trust his instructions during training, and even inform him over loose end information. But after revealing her true identity to Tedashii it could possibly indicate her friendship with the coach was nothing more than a cover.

Tedashii Hamasaki
When she first met Tedashii, she deem he was over his head for assuming he could come up with a formula to put Sogiita in check, assuming he must be some cocky level four with an interesting Esper ability. When she discovers his name she completely calls him an asshole for making Li-Mei cry confirming she heard of his rude actions at the shopping center, and threatened to kill him while introducing herself to him. She shows more hate towards him enjoying watching him get blast off by Sogiita calling it a running gag of scientific perfection. However she was force to reveal her true identity as a ninja to gain Tedashii's aid to save Li Mei from TARTY after witnessing his nano digital code breaker suit during their clash. Tedashii is the only person to know of her true identity, even having more in common in the shadows rather than the light. Despite this she seen a unstable side of Tedashii and rather avoid him and keep Li Mei away from him at all cost, despite his efforts to save Li Mei, Jeong-Min reminds Tedashii of her promise threat. When ally with Tedashii, she admits his strength, and useful capabilities, after seeing his Coilgun in action.

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Chronology

Background
So far nothing is known about her pass expect hints that she could be Korean but it no longer is confirmed, sometime in her life she join the Oda Clan becoming a ninja. And attend a unnamed high school going uncover to investigate on Academy City's Power Curriculum Program & Gemstone mainly Sogitta Gunha.

(A Certain Scientific Code Vader)

Tree Diagram Remnant Arc
She first appears as a cameo in the epilogue hugging Li Mei, and calling her yeodongsaeng. Something during this time of event Li-Mei must have either told her or she found out of the incident that happened between Tedashii and Li-Mei in the shopping center.

Daihaseisai Royale Arc
She is first mentioned in the arc unknowingly dissing Li-Mei's tryouts. She is later making her first true introduction outside the school's stadium, approaching Tedashii and the school's coach. She joins the conversation defending Sogiita status from Tedashii rude assumption of believing he could handle the lowest ranking Esper. Once Sogiita appears before them and Tedashii tense up she smirks and high five Sogiita. After learning of Tedashii's name she comments about known about the fight he had with Li Mei and saids unlike her she could see that he was asshole. she introduced herself and threatens to kill Tedashii if he ever made Li Mei cry again. Before leaving she comments on the idea of Sogitta and Tedashii working together will be a interesting concept.

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Quotes

[Jeong-Min remarks to Tedashii's personally (Code Vader - 11)]: "You must be one of those over confident level 4's that don't know their place?"

[Ibid, Talking about Sogiita to Tedashii]: "Look I know Sogiita-San is ranked 7th the lowest of all the level 5's but don't take him for granted, he's only ranked the lowest because science can't handle his potential."

[IBid, Threatened Tedashii to never make her cry again]: "Well if what she said is true, then this should be an interesting pair up. And one more thing, the name's Jeong-Min, make her cry again and remember the name that will kill you. Hmph see ya."

[Ibid Tedashii, Explaining herself for using Li Mei and objective for her Clan] "As a member of the Oda clan. I will help restore our prestige in the world. With Li Mei and Academy City's Power Curriculum Program, I'll be able to prove the existence of Gemstones, and, as such, obtain the means to develop genuine supernatural powers. Though I am aware I am using Li Mei for selfish reasons, I promise myself that Li Mei will not be harm in my objectives."