Fact Check: Why Is January 9th Known As BTS’s “Jungkook Day”?

Did you know that January 9th is a special day where ARMYs celebrate BTS‘s Jungkook?

BTS’s Jungkook | Weverse

The day, name “Jungkook Day” or “JK Day,” dates back to 2018. In BTS’s Seasons Greetings 2018 calendar, Jungkook marked January 9th as “Jungkook Day.”

| Season’s Greetings 2018

He also wrote a specific message for ARMY to explain what they should do on this special day.

JK DAY — Do something, whatever it be, and upload it!!! (On the internet)

— Jungkook

| Season’s Greetings 2018

He chose this day (1/9) because it is the opposite of his birthday, September 1st (also known as 9/1).

| BIGHIT Music

He has even celebrated the special occasion online, making a commemorative tweet.

| @BTS_twt/Twitter

ARMYs celebrated this year with special hashtags and phrases, including #NeverLetJungkookGo and HAPPY JK DAY 2025.

when jungkook declared january 9th (opposite as his birday) as jungkook day and wrote 🥺

🐰“even if u don’t know what it is trend JK DAY” #NeverLetJungkookGo
HAPPY JK DAY 2025 pic.twitter.com/MBmcJ5mdpJ

— Carolyne🌱⁷⁼¹ (@mhereonlyforbts) January 8, 2025

Jungkook marked January 9th as JK DAY in 2018 Season’s Greetings Calendar & later confirmed it on Twitter in 2019. We celebrate JK Day every year and shower him with love. Use the below hashtags to celebrate 🤍 #NeverLetJungkookGo
HAPPY JK DAY 2025 pic.twitter.com/1BXe8EBDKg

— Daily jk praise  (@dailyjkpraise) January 8, 2025

Many of the commemorative posts shared their favorite videos and moments of Jungkook.

happy jungkook day 🥹💕 #NeverLetJungkookGo
HAPPY JK DAY 2025 pic.twitter.com/D6w1cGHYES

— ℘ (@97SARCHIVES) January 8, 2025

Happy day to the love of my life 🫶#NeverLetJungkookGo
HAPPY JK DAY 2025 pic.twitter.com/2GCGVfP63l

— imene⁷ ℘ (@jeonprotector) January 8, 2025

Let’s trend this, and share love, happiness and support for our precious golden boy!#NeverLetJungkookGo
HAPPY JK DAY 2025

pic.twitter.com/SGxklVLv6V

— 나비.97 (FAN) (@goldenjeonstar) January 8, 2025

Jungkook recently left a letter for ARMYs on Weverse. Read the full message below.

BTS’s Jungkook Greets 2025 With Heartfelt Letter For ARMYs

BTS