Korean Language Instructor Seung-jun, with 38,000 YouTube Subscribers, Surpasses 2.5 Million Total Views

Accent Ace Inc. (Headquarters: Chuo-ku, Tokyo; Representative: Seung-jun Yoon), which operates the online Korean language school "K-PRO," is pleased to announce that the total number of views on the official YouTube channel "Korean is 90% Pronunciation" operated by representative Seung-jun has surpassed 2.5 million as of July 1, 2026.

The channel was established on September 20, 2023, with the first video released on December 9 of the same year. Full-scale operation began in June 2024.

Based on a unique learning method that teaches Korean starting from "pronunciation" rather than "grammar," the channel provides easy-to-understand explanations of Korean pronunciation, listening comprehension, and conversational expressions for beginners and those who have struggled with learning. Currently, the number of channel subscribers exceeds 38,000, and it continues to grow as a pronunciation-focused channel for Korean learners in Japan.

Background of YouTube Channel Growth

"Korean is 90% Pronunciation Seung-jun" continuously publishes videos on Korean pronunciation, listening comprehension, and learning methods. The total number of views surpassed 1 million in October 2025 and 1.5 million in December of the same year. The channel continued to gain viewers smoothly, surpassing 2.5 million total views as of July 1, 2026.

The channel clearly explains the differences in pronunciation that Korean learners often struggle with and the unique Korean sounds that are difficult for Japanese speakers to distinguish, using mouth shapes, tongue positions, and sound changes. It has been supported by many viewers as practical learning content that emphasizes understanding the correct sounds and practicing by moving the mouth, rather than memorizing Korean.

Furthermore, it disseminates Korean learning methods centered on pronunciation for learners who face challenges such as "I'm studying Korean but can't understand," "I speak but I'm not understood," or "I freeze up in conversations." A key feature is the explanation of points that are difficult for Japanese learners to understand through self-study, such as Korean-specific vowels and consonants that do not exist in Japanese, liaison, and the differences between tense, aspirated, and unaspirated consonants, all in easy-to-understand terms for beginners.

In addition, by connecting Korean language learning with themes that learners are highly interested in, such as Korean travel, "oshikatsu" (supporting idols/characters), Korean dramas, K-POP, and daily conversation, the channel has expanded its support as practical Korean content that goes beyond simple language explanations.

The main features are as follows:

Unique method of learning Korean from "pronunciation" rather than "grammar"

Explanation of sounds difficult for Japanese speakers to distinguish, based on mouth shape and sound changes

Structure that is easy for beginners and those who have given up on learning to understand

Practical content linked to Korean travel, "oshikatsu," Korean dramas, and K-POP

Systematic content utilizing the know-how of online Korean school "K-PRO"

Representative Video Content

The channel features numerous videos that allow beginners to learn by actively moving their mouths, covering Korean pronunciation, vocabulary, listening comprehension, and shadowing.

The popular "Korean Can Be Spoken in 5 Days" series introduces words and expressions useful for daily conversation, "oshikatsu," and Korean travel, leveraging the accurate pronunciation honed as a former announcer. The videos are structured for viewers to practice by speaking aloud, aiming to make the language easier to use in actual conversations by learning pronunciation along with vocabulary, not just memorizing words.

Additionally, videos on Korean pronunciation errors commonly made by Japanese speakers explain unique Korean vowels, consonants, and sound changes without relying too heavily on technical jargon, using language that is easy for beginners to understand. They are designed to help learners understand the difference between their own pronunciation and that of native speakers, which can be difficult to notice through self-study, and the content is designed for learners to feel the effects of their study in a short amount of time.

Furthermore, videos aimed at improving Korean listening skills through shadowing and videos introducing practical phrases useful for Korean dramas, "oshikatsu," and Korean travel are also available. To ensure learners can continue studying enjoyably, content is created by connecting language learning with interest in Korean culture.

Past Lecture and Class Achievements

A lecture on Korean culture was held at Tsukishima Elementary School. The lecture, themed around Korean culture, was conducted in a quiz format emphasizing background understanding alongside language, aiming to increase students' interest in different cultures. [Targeting 500 students in grades 3-6] Seung-jun, Representative of Online Korean School K-PRO, Gives Lecture at Chuo City Tsukishima Elementary School

Two preparatory lectures for a Korean study tour were held at Katsushika Sogo High School. In addition to teaching practical Korean phrases useful for the trip and providing pronunciation correction, lectures were given on communication points to facilitate smooth interaction with local students and deepening understanding of Korean culture. [Lecture for 200 high school students] Seung-jun, Representative of Online Korean School K-PRO, Gives Lecture at Tokyo Metropolitan Katsushika Sogo High School for Korean Study Tour

Seung-jun, Representative of K-PRO, Gives Second Lecture at Katsushika Sogo High School on March 17, Teaching Korean Culture and Practical Pronunciation Instruction

A special lecture on multicultural understanding and overseas study was held at Tokyo Metropolitan Afu High School. Representative Seung-jun shared his experiences as a government-sponsored international student, discussing how to approach different cultures and future possibilities. After the lecture, individual consultations were offered to students interested in studying in Korea, providing personalized advice and practical support.

Seung-jun, Representative of K-PRO, Gives Special Lecture at Tokyo Metropolitan Afu High School on March 11, Offering Multicultural Understanding and Study Abroad Support

An online lecture on "Career Formation Theory" was held for first-year students in the general course at Waseda Osaka High School. The lecture shared Seung-jun's diverse career experiences and perspectives, aiming to provide students with an opportunity to think about their own unique career paths.

Korean Language Instructor Seung-jun, with 37,000 YouTube Subscribers, Lectures on Career Formation at Waseda Osaka High School

Profile of Korean Language Instructor Seung-jun

Born in Seoul, South Korea. Graduated from Kyoto University, Faculty of Integrated Human Studies (majoring in neuroscience, physiology, and linguistics). Attended an international school in Korea through junior high and high school, and came to Japan as a Ministry of Education, Culture, Sports, Science and Technology (MEXT) scholarship student after graduating from high school. After graduating from university, he worked at Recruit Co., Ltd. before starting his own business. Fluent in four languages: Korean, Japanese, English, and Chinese. Achieved perfect scores on the Japanese Language Proficiency Test N1 and TOEIC, and HSK Level 4 in Chinese. Representative Korean Culture Instructor at the Korean Cultural Center, Korean Embassy in Japan. Also works as a Korean language coach for artists affiliated with AVEX. Operates the YouTube channel "Seung-jun: Korean is 90% Pronunciation" (38,000 subscribers), where he teaches beginners and those who have struggled with learning how to speak in a short period.

Instagram: https://www.instagram.com/seungjoonyun/

TikTok: https://www.tiktok.com/@seungjoonyun

YouTube: https://www.youtube.com/channel/UCCxS_ExpILN5I817YKvwhQA

Media Coverage and Appearances (Partial List)

HuffPost

"Is the Reason Your Korean Isn't Improving Because You Start with Grammar? A University of Kyoto Graduate, Korean Instructor, Teaches Beginners "Sound Training" Study Methods"

"Recommended Programs for Studying Korean? A Popular Instructor, a University of Kyoto Graduate, Discusses the Pitfalls of Apps and How to Choose Proficiency Tests" "Useful Korean Phrases for 'Oshikatsu' and Travel. What Expressions Should You Be Careful of at Fan Meetings? Heard "Words That Make Your Idol Happy""

Nikkan SPA!

""Forbidden Mobile Phones, Shaved Heads, Tears Uncontrollable from Tear Gas" The Grueling Reality of Military Service Experienced by All Young Korean Men. BTS Is No Exception"

"The Truth About Korea's "Abnormal Education System." Lectures Cost "100,000 Yen Per Session"... The Reason for Spending "The Price of a House" on Education for One Child"

@DIME

"Why Did BTS's New Release Cause an Outcry in Their Home Country? An Expert from Seoul Explains the "Side Effects of Global Strategy""

Chiba TV

KAN・KAN・KAN! ~Seung-jun's 5-Minute Easy Korean Drama~

Morning Compass "Mr. Seung-jun's Korean Class"

About Online Korean Language School "K-PRO"

"K-PRO" is an online Korean language school operated by Accent Ace Inc. Leveraging the knowledge of neuroscience and linguistics that representative Seung-jun acquired at Kyoto University, it provides instruction that enables beginners and those who have struggled with learning to speak Korean in a short period through its unique pronunciation method and practical curriculum. It features a practical-oriented approach that focuses on "pronunciation" and "usable expressions," rather than traditional grammar-memorization-centered learning.

Company Profile

Company Name: Accent Ace Inc.

Address: Ginza TH Bldg. 9F, 7-13-20 Ginza, Chuo-ku, Tokyo 104-0061

Established: July 17, 2024

Business Activities: Korean language education, online school operation, planning and operation of Japan-Korea exchange events

Company HP: https://accentace.co.jp/