High Cookie

It aired on U+ Mobile TV from October 23 to November 23, 2023, every Monday to Thursday. It is also available for streaming on Netflix Korea.

High Cookie
Promotional poster
Also known as	Hi Cookie
Hangul	하이쿠키
Revised Romanization	Haikuki
McCune–Reischauer	Haik'uk'i
Genre	Mystery Thriller Crime
Developed by	Studio X+U (planning)
Written by	Kang Han
Directed by	Song Min-yeop
Starring	Nam Ji-hyun Choi Hyun-wook Kim Mu-yeol Jung Da-bin
Country of origin	South Korea
Original language	Korean
No. of episodes	20
Production
Running time	30 minutes
Production companies	Arc Media Monster Union Studio X+U
Original release
Network	U+ Mobile TV
Release	October 23 (2023-10-23) – November 23, 2023 (2023-11-23)

The series is about an elite high school being engulfed by a mysterious homemade cookie that makes desires come true with just one bite. However, having more than one cookie can cost one their life. After Choi Soo-young (Nam Ji-hyun)'s sister falls prey to the cookie and goes into coma, she pretends to be a student at Jeonghan High School to find the anti-dote as well as the Chef, the maker of the cookies.

Main

• Nam Ji-hyun as Choi Soo-young / Lee Eun-seo

A non-regular factory worker and the older sister of Min-young. Soo-young became the head of the family at the age of only 18 and dropped out of school to take care of her younger sister. After Min-young gets into an accident, she is forced to enter Jeonghan High School under the new identity of Lee Eun-seo to find her sister's assailant.

• Choi Hyun-wook as Seo Ho-su

A genius student who maintains top grades at Jeonghan High School which is the best private high school in Korea. Although he perseveres in his studies despite the difficult circumstances, he is known as an easy-to-use 'good guy' among his wealthy classmates. It was later revealed that he is Chef, the original creator of the drugged cookies.

• Kim Mu-yeol as Yoo Seong-pil

The best college entrance exam consultant in the shadows. Seong-pil is famous for making students' dreams come true by providing the best results regardless of whether it is legal, expedient, or illegal, but he is a person who is completely shrouded in mystery. He comes to Jeonghan High School on his own initiative and offers to serve as a consultant for all 3rd grade students.

• Jung Da-bin as Choi Min-young

Soo-young's younger sister who is a student at Jeonghan High School. She acts cold but loves her sister a lot. Due to having a scar on her face, she always wears a mask to hide it. She was the distributor of the cookies.

Supporting

• Seo Bum-june as Song Jin-woo

He is the most popular student and get the best grades. He is the school's chairman's grandson and uses his privilege to do as he pleases.

• Chae Seo-eun as Park Hee-jin

An honor student in Class S. She has a crush on Jin-woo and becomes jealous when he becomes friendly with Min-young.

High Cookie was co-produced by Arc Media and Monster Union, and was released on U+ Mobile TV and Netflix. Since it is about youth drugs and is not easy to cover on terrestrial broadcasters, it was broadcast on OTT to increase efficiency. After its first release on October 23, 2023, it ranked high on Netflix Korea, and is known to have had a positive impact on the increase in U+ mobile TV subscribers.

Immediately after its release, High Cookie ranked first in U+ Mobile TV content ranking including movies and dramas. Kino Rights ranked it first for two consecutive weeks and three weeks in total including the first day of its release. It also ranked first among non-original series and second in the top 10 on Netflix in Korea. The actors were also praised for their performance in the show.