Younghee Mandlebom[3] is a Korean girl who is Leslie's best friend. She is usually mean to Leonard Helperman. But she actually cares for him, even showing that she had a crush on him at least twice. She doesn't want anything bad to happen to Leonard and does not appreciate it when he does something dangerous, scary, or foolish.


Younghee is Leslie's best friend and Leonard's frenemy. She is in Leonard's class and, many of the other kids, she is often mean to Leonard and teased him on a recurring basis. But, most of the time she cared for him and had a crush on him.


  • She is similar to Helga G. Pataki from Hey Arnold! They both bully the main character but secretly have a crush on them.


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Teacher's Pet(Episode List)Teacher's Pet: The Movie
Leonard HelpermanSpot Helperman/Scott Leadready IIMary HelpermanCrosby StricklerLeslie DunklingPretty BoyMr. JollyIan WazselewskiTyler, Trevor, and TaylorChelsey and KelseyYounghee MandlebomTallulahRuthDr. Ivan KrankDennis and AdeleMiss DewygoodEmma (Teacher's Pet)
"Muttamorphosis" • "Pet Project" • "Movin' on Pup" / "Escaping Dog Trick" • "A Lick is Still a Kiss" • "Being Mrs. Leadready" • "Let Sleeping-Over Dogs Lie" / "Costume Pity Party" • "Scott's Honor" • "Fifi" • "Bad to the Bone" / "Always Knock the Postman Twice" • "You Can't Bite City Hall" • "A Dog for All Seasons" • "Tallulahpalooza" • "Saving Mr. Jolly" / "Rule of Paw" • "Never Take Candy from a Kindergartner" • "A Few Good Boys" • "Bad Fur Day" • "The Tale of the Telltale Taffy" • "Don't Count Your Chickies Before They Hatch" • "No Substitutions, Please" • "Mr. Jolly: Man...or Mouser?" / "Party Animal" • "Taint Valentine's Day" • "Strickler's Pet" / "Fresh 'n' Frozey Chocolaccino" • "The Grass Seed is Always Greener..." • "Don't it Make My Brown Eyes Green" • "What's Sweat Got to Do with It?" • "Dogfight" • "Science Not Fair" • "To Bee or Not to Bee" • "One Dog's Junk" • "Team Scott" / "Take Me Out of the Ball Game" • "Inspector Leadready II" • "The Turkey That Came to Dinner • "Double Dog Dare" • "Attack of the 50 Inch Girl" • "The Flipper" • "The Blight Before Christmas" • "All About Eavesdropping" • "The Nose Knows" / "Don't Bite the Hound That Feeds You" • "A Breed Apart"
I, Ivan KrankSmall But MightyA Whole Bunch of WorldTake the Money and RunI Wanna Be a BoyI'm Moving OnProud to Be a DogA Boy Needs a Dog