Popsugar Entertainment Netflix Twenty-Five Twenty-One: How Old is the Cast? Are the Cast of "Twenty-Five Twenty-One" Actually Teens? Let's Find Out 3 March 2022 by Divya Meena Image Source: Everett Collection Netflix's latest Korean romance drama, "Twenty-Five Twenty-One," follows the budding friendship-turned-romance between Na Hee-Do (Kim Tae-ri) and Baek Yi-Jin (Nam Joo-Hyuk) at different stages of their lives. The story jumps back and forth between the '90s and 2021, with most of the storyline taking place over the span of four years beginning in 1998 when Hee-Do is 16 and Yi-Jin is 20. (On the show, the characters' ages are referenced as 18 and 22, but this is because, in Korea, babies are considered one year old the day they're born, and then they get a year older on new year's, making their Korean age one or two years older than their international age.) So, are these actors who portray high-schoolers in 1998 actually teenagers? Well, as is the case with most Gen-Z-focussed teen dramas, the cast members of "Twenty-Five Twenty-One" are not necessarily the same age as their on-screen characters. But, considering how heavily the show focuses on age difference (I mean, the title is literally Yi-Jin and Hee-Do's ages), what may surprise you is how very different the actors' ages are from their characters behind the scenes. For a complete rundown of just how close in age the cast is to their fictional characters on "Twenty-Five Twenty-One," continue scrolling to find out the details. How Old Is Kim Tae-Ri, aka Na Hee-Do? 31 View this post on Instagram A post shared by 김태리 (@kimtaeri_official) Kim Tae-Ri's birthday is April 24, 1990, making her 31 years old — 15 years older than her character Hee-Do at the start of "Twenty-Five Twenty-One." 1 / 8 How Old Is Nam Joo-Hyuk, aka Baek Yi-Jin? 28 View this post on Instagram A post shared by 남주혁 (@skawngur) Yi-Jin being four years older than Hee-Do is a major aspect of "Twenty-Five Twenty-One"'s plot, but it's the opposite in real life. Nam Joo-Hyuk's birthday is on February 22, 1994, making him four years younger than Kim Tae-Ri in real life. 2 / 8 How Old Is Bona, aka Go Yoo-Rim? 26 View this post on Instagram A post shared by BONA (@bn_95819) Bona's birthday is August 19, 1995, meaning she's about a decade older than her character Yoo-Rim. 3 / 8 How Old Is Choi Hyun-Wook, aka Moon Ji-Woong? 20 View this post on Instagram A post shared by 최현욱 (@_choiiii__) Born on January 30, 2002, Choi Hyun-Wook is closest among the high-schooler cast to the age of his 16-year-old character. 4 / 8 How Old Is Choi Myung-Bin, aka Kim Min-Chae? 13 View this post on Instagram A post shared by 최명빈 actress (@choimyeongbeen) Choi Myung-Bin's birthday is April 15, 2008, making her about the same age as Hee-Do's daughter. 5 / 8 How Old Is Lee Joo-Myung, aka Ji Seung-Wan? 28 View this post on Instagram A post shared by @jmyoungl Lee Joo-Myung's birthday is December 1, 1993, making her 12 years older than her character 6 / 8 How Old Is Kim Hye-Eun, aka Yang Chan-Mi? 49 View this post on Instagram A post shared by 김혜은 (@kimhyeeun11) Kim Hye-Eun birthday is on March 1, 1973. 7 / 8 How Old Is Kim So-hyun, aka Adult Na Hee-Do? 46 View this post on Instagram A post shared by 뮤지컬배우 김소현 SohyunKim (@sofiakim1112) Kim So-Hyun's birthday is November 12, 1975. 8 / 8 NetflixKim Tae-RiNam Joo-HyukTwenty-Five Twenty-OneStreamingTV