In South Korea, your age *very* is important. At the same time, there's also a difference between your age right now to how old you are in SoKor. It's not calculated when you celebrate your birthday but the change is only counted when it's January 1. In short, you will always be one year older in Korean age.
If you have noticed in K-dramas, their culture is rooted in how old they are and this is seen in their interaction with others. For example, there's a specific way on how you should drink alcohol in front of your sunbae (senior). You should also not call someone older just by their name and must attach eonnie, oppa, noona, or hyung all the time. That's why when you're mingling with Koreans, it's best to know who's the oldest in the group.
For some Korean celebrities, they can call their fellow stars as chingu (friend) since they're of the same age, Wonder who they are? Here are some of your fave Korean actors and actresses who were born in the same year:
1. Kim Seon Ho and Park Min Young
The year they were born: 1986
Current age (2021): 35
Where you've seen Kim Seon Ho: Start-Up, Welcome To Waikiki 2, 2 Days 1 Night

Where you've seen Park Min Young: What's Wrong With Secretary Kim, Her Private Life, City Hunter

2. Sandara Park and Shin Min Ah
The year they were born: 1984
Current age (2021): 37
Where you've seen Sandara Park: 2NE1's promotional activities, We Broke Up, Missing Korea

Where you've seen Shin Min Ah: My Girlfriend Is A Gumiho, Oh My Venus, Chief Of Staff

3. Kim Soo Hyun and Ok Taecyeon
The year they were born: 1988
Current age (2021): 33
Where you've seen Kim Soo Hyun: It's Okay To Not Be Okay, My Love From The Star, Dream High

Where you've seen Ok Taecyeon: Vincenzo, Save Me, Bring It On, Ghost

4. Lee Dong Wook and Song Hye Kyo
The year they were born: 1981
Current age (2021): 39
Where you've seen Lee Dong Wook: Tale Of The Nine-Tailed, Goblin, My Girl

Where you've seen Song Hye Kyo: Descendants Of The Sun, Encounter, That Winter, The Wind Blows

5. Kim Da Mi and Lee Do Hyun
The year they were born: 1995
Current age (2021): 26
Where you've seen Kim Da Mi: Itaewon Class, The Witch: Part 1 The Subversion

Where you've seen Lee Do Hyun: 18 Again, Sweet Home, Hotel Del Luna

6. Song Kang and Bae Suzy
The year they were born: 1994
Current age (2021): 27
Where you've seen Song Kang: Navillera, Love Alarm, Sweet Home

Where you've seen Bae Suzy: Start-Up, Vagabond, Uncontrollably Fond

7. Park Hyung Sik and Hwang In Yeop
The year they were born: 1991
Current age (2021): 30
Where you've seen Park Hyung Sik: Hwarang, Strong Woman Do Bong Soon, Suits

Where you've seen Hwang In Yeop: True Beauty, 18 Again, Tale Of Nokdu

8. Gong Hyo Jin and Jo Jung Suk
The year they were born: 1980
Current age (2021): 41
Where you've seen Gong Hyo Jin: When The Camellia Blooms, It's Okay, That's Love, The Master's Sun

Where you've seen Jo Jung Suk: Hospital Playlist, Oh My Ghost, Jealousy Incarnate

9. Cha Eun Woo and Kwak Dong Yeon
The year they were born: 1997
Current age (2021): 24
Where you've seen Cha Eun Woo: True Beauty, My ID Is Gangnam Beauty, Rookie Historian Goo Hae Ryung

Where you've seen Kwak Dong Yeon: Vincenzo, It's Okay To Not Be Okay, Love In The Moonlight

10. Song Joong Ki and Lee Dong Hwi
The year they were born: 1985
Current age (2021): 36
Where you've seen Song Joong Ki: Vincenzo, Arthdal Chronicles, Descendants Of The Sun

Where you've seen Lee Dong Hwi: Reply 1988, Entourage, Pegasus Market

11. Shin Hye Sun and Kim Bum
The year they were born: 1989
Current age (2021): 32
Where you've seen Shin Hye Sun: Mr. Queen, Angel's Last Mission: Love, The Hymn Of Death

Where you've seen Kim Bum: Law School, Tale Of The Nine-Tailed, Boys Over Flowers

12. Son Ye Jin and Yoo In Na
The year they were born: 1982
Current age (2021): 39
Where you've seen Son Ye Jin: Crash Landing On You, Something In The Rain, The Last Princess

Where you've seen Yoo In Na: Touch Your Heart, Goblin, My Love From The Star

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