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English
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Published:
2025-12-27
Updated:
2026-01-06
Words:
5,099
Chapters:
5/?
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3
Kudos:
19
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Kim Seungmin vs the devil's own math

Summary:

“Wait, Yongbok,” Minho said suddenly. “Don’t you have that ex who's literally a math major? The one who does music with Jisung?”

Felix slapped himself on the forehead. “Mate. You’re so right, how could I forget?”

“You really have a math major ex?” Seungmin asked. “What’s his name? Would he help me?”

“Her name is Chaebin,” Felix corrected. “She is such a sweetheart! And she’d totally help you if I asked her. Can I?”

He hesitated for only half a second. “Yes. Absolutely.”

Notes:

Disclaimer: this is a work of fiction! (Obviously, as if it being on a fanfiction website wasn't a big clue to that.) None of the things the characters do in these pages is meant to be a reflection of reality or a speculation on any real people or their relationships. Please do not interpret it as such. (Really this is so unserious, I hope you have as much fun reading it as I had writing it!)

Chapter 1: So it begins

Notes:

(See the end of the chapter for notes.)

Chapter Text

With an exasperated sigh, Kim Seungmin pushed his linear algebra homework papers across the table, folded his arms atop the newly unoccupied space, and dropped his head onto them. 

(You have to know the man. He was practically screaming.) 

“That doesn’t look like doing homework,” came a deep, teasing voice from the other side of the room. 

Seungmin cracked an eye to glare at his roommate’s boyfriend, Felix, who had come over for a study session. “You wanna take a stab at it?”

“What is it?”

“Linear algebra.”

Felix leaned over, pulling one of the worksheets across the table and studying it with a frown. “This doesn’t look like algebra to me.”

Seungmin’s roommate, Hyunjin, chuckled at that. “Linear algebra, Lix. It’s like, super-meta-uber math. Not the kind of stuff you’re learning to teach to fifth graders.” 

Felix’s nose wrinkled. “Ew. And this is necessary for civil engineering because…?”

“I have no freaking clue,” Seungmin said. “But I’ve failed the first exam, and I just barely passed the first homework assignment, and now it looks like I’m gonna fail this homework as well.” His stomach twisted uncomfortably. “I need to keep my GPA above a 3.7 if I want to keep my scholarship. I literally cannot afford to fail this class.” 

Hyunjin nodded, steepling his fingers. “Minho-hyung is also some kind of engineering major, right, Felix?”

“Yeah, biomedical.”

“Do biomedical engineers need to take super-meta-uber math?” Hyunjin posed this question to Seungmin, for some reason. 

“How should I know what those crazy masochistic assholes have to take? Plus, your dance captain is even scarier than these equations,” said Seungmin with a small huff. He wasn’t entirely joking. 

“He’s not that bad,” Felix protested. “Look, bring your homework to the dance practice rooms tomorrow. Our practice lets out around 5, and we’ll both be there to talk to him with you.”

 

 

“No,” Minho said after taking one look at the papers Seungmin held out.

“No, as in, you didn’t have to take it?”

“Oh, I had to take it, all right. Worst semester of my life.” He shook his head. “I always swore I’d never touch that stuff again, but then the universe presented me with the beautiful gift of tensor calculus and arterial wall mapping.” 

Seungmin looked at Hyunjin to see if he understood any of that.

Hyunjin raised his hands in a shrug.

“It’s weird that they’re making civil engineers take it, though,” Minho mused. “I can accept that this crap has biomedical applications, but in what world are you going to…like…build a bridge and have to analyze it with a vector space?”

“Your guess is as good as mine.” Seungmin frowned at the offending papers. “Guess I’m back to square one again. Do any of you know when the withdrawal deadline is?”

“Wait, Yongbok,” Minho said suddenly. “Don’t you have that ex who's literally a math major? The one who does music with Jisung?”

Felix slapped himself on the forehead. “Mate. You’re so right, how could I forget?”

“Because I make all your exes completely forgettable by comparison,” Hyunjin said smugly, hooking his chin over Felix’s shoulder as he hugged him from behind. 

Minho pretended to gag. 

“You really have a math major ex?” Seungmin asked, too desperate to make any of his usual comments on his best friends’ disgusting PDA. “What’s his name? Would he help me?”

Her name is Chaebin,” Felix corrected. “She is such a sweetheart! And she’d totally help you if Hyunjinnie or I asked her.” 

“Yes, Felix, we get it, you’re well-adjusted and stay friends with all your exes,” Minho said with a roll of his eyes.

Felix nodded eagerly. “I am! Can I ask her for you, Seungmin?” 

He hesitated for only half a second. “Yes. Absolutely.”

Notes:

Thanks for reading! I hope this isn't too badly written, so feel free to leave constructive criticism (or destructive, that's fine too haha). I 100% stole Minho being a BME major from ockleibi's legoverse, which is awesome and something you should totally check out if you haven't! Some of my friends in uni are BME, and they definitely give Minho vibes (in that I am a little bit scared of them, but they are cooler than cool). Anyway, I'm not great at being consistent, but I'll definitely be continuing this fic whether or not there's interest in it, this is a story concept I'm interested in exploring :-)