February 20 (2026-02-20)– April 3, 2026 (2026-04-03)
In Your Radiant Season (Korean:찬란한 너의 계절에) is a 2026 South Korean television series written by Jo Sung-hee, directed by Jeong Sang-hee[ko] and Kim Young-jae[ko], and starring Lee Sung-kyung and Chae Jong-hyeop. The series tells the story of Sunwoo Chan, who lives life to the fullest, and Song Ha-ran, who is stuck in her emotions, and how their connection brings warmth and change to both their lives when they meet. It aired on MBC TV from February 20 to April 3, 2026 every Friday and Saturday at 21:50 (KST). It is also available for streaming on Disney+.
Synopsis
In Boston, Sunwoo Chan found solace in messaging with Song Ha-ran, his roommate Kang Hyuk-chan's girlfriend. Their laptops had been swapped, and Sunwoo Chan had been talking to her anonymously. He formed a secret bond with her, even sending her a pen as a gift, all without revealing his true identity. An explosion in Boston claimed Kang Hyuk-chan's life and left Sunwoo Chan with serious injuries and partial memory loss. He later reunited with Song Ha-ran in Korea, collaborating with her fashion brand Nana Atelier. Traumatized by her parents' fatal accident and Kang Hyuk-chan's death, Song Ha-ran cut ties with strangers. Sunwoo Chan's warmth slowly opened her up, but his sudden departure sparked curiosity. Nana Atelier's CEO, Kim Na-na, Song Ha-ran's grandmother, is struggling with dementia symptoms and contemplating retirement. Meanwhile, Song Ha-ran's sister, Song Ha-young, develops feelings for Yeon Tae-seok, a longtime employee of Kim Na-na. Their romance is complicated because Tae-seok was likely responsible for her parents' car accident. Song Ha-dam, the youngest, is crushing on high school baseball star Cha Yu-gyeom. He is the only one who knows about her grandmother's dementia.
The eldest sister of the three sisters. She's the head designer at Nana Atelier, Korea's top fashion house, hiding behind a perfect image. She's trapped in grief, still hurting from past losses. Then she meets Sunwoo Chan, and her carefully controlled world starts to fall apart.
A character designer at a top animation studio. Behind his sunny personality, he harbors deep scars from a mysterious accident in the past that caused him to lose his hearing and memory. But when he meets Ha-ran, he's forced to face a shocking secret.
She is the maternal grandmother of the three Song sisters, and the head of Nana Atelier, South Korea's top high-end fashion house. She is a first-generation designer who is a perfectionist with a cold, sharp professional image, earning her the nickname "the Anna Wintour of Korea".
She is the younger sister of the protagonist Song Ha-ran and the older sister of Song Ha-dam. She often acts as a protector for Ha-ran against their pushy grandmother, Kim Na-na. She also works as a junior designer on the design team at Nana Atelier.
She is the youngest sister. Though she appears to be the most resilient sister—ranking first in her class and handling her affairs independently—this is actually a survival tactic to avoid being seen as a "pitiful child" due to her family's past.
Chan's Family
Kang Ae-shim as Chan's grandmother (Kim Seon). She is a master ceramicist. Unlike Chan's father, Sunwoo Seok, who is authoritarian and distant, his grandmother provides an emotional safety net.
Jung Hae-kyun as Chan's father (Sunwoo Seok): He is a central figure in Chan's "painful past". Flashbacks reveal that Seok was emotionally and sometimes physically cold toward Chan, eventually sending him abroad to the U.S. to get him out of sight after Chan refused to follow the family's ceramicist path.
He is a barista and runs a quiet alleyway café called "Rest". He acts as a life senior and advisor to the younger generation and has a past with Kim Na-na.
Kim Tae-young as Cha Yu-gyeom
He is a top national high school baseball pitcher and Ha-dam's boyfriend. He shares a special bond with Ha-dam's grandmother, acting as a reliable grandson figure to her.
He is the COO of Nana Atelier and is the loyal "right-hand man" to the company's head. It is slowly revealed that his connection with the Nana family and Nana Atelier dates back 15 years.
A junior designer in the Design Team 1 at Nana Atelier.
Lee Seung-yeon as Jeon Pu-reum
Nana Atelier Design Team 1 Assistant Designer.
Yoon Chae-bin as Kim Sol
Nana Atelier Design Team 1 Intern.
People around Chan
Firas A. Naji as Ben - A friend or colleague from Chan's time in the United States and current work acquintance.
Kwon Do-hyung as Kang Hyuk-chan - He was Sunwoo Chan's university colleague in the U.S. and Song Ha-ran's former boyfriend who tragically died in the explosion seven years ago.
Production
Development
The series is planned by Namgoong Sung-woo, co-directed by Jeong Sang-hee and Kim Young-jae, written by Jo Sung-hee, and produced by Pan Entertainment.
On November 13, 2025, Pan Entertainment announced that it had signed a production and supply agreement with MBC worth ₩15.2 billion.
Casting
In 2023, Han Hyo-joo was initially cast as the female lead, but was later recast with Lee Sung-kyung considering it and Seo In-guk considering the male lead.
In May 2025, Chae Jong-hyeop reportedly received an offer to play the role of Sunwoo Chan, which was initially offered to Seo. In September, the casting of Lee and Chae as the leads was officially confirmed. The next month, Lee Mi-sook, Kang Seok-woo, Han Ji-hyun, Oh Ye-ju, and Ki Hyun-woo joined the cast.
In Your Radiant Season was reportedly scheduled to premiere on MBC TV in the first half of 2026. On January 13, 2026, a script reading was revealed, and the series officially confirmed its premiere on February 20, 2026, airing on a Friday–Saturday timeslot at 21:50 (KST). It will also be available for streaming on Disney+.
Viewership
In Your Radiant Season: South Korea viewers per episode (thousands)
Season
Episode number
1
2
3
4
5
6
7
8
9
10
11
12
1
835
693
798
550
724
554
579
491
N/A
456
482
548
Source: Audience measurement performed nationwide by Nielsen Korea.
In the table above, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
N/A denotes ratings that were not published.
Notes
↑Due to multiple unpublished ratings, the exact average rating is unknown.
References
123456Son, Bong-seok (September 25, 2025). '찬란한 너의 계절에' 이성경X채종협 출연 확정[공식][Official: Lee Sung-kyung and Chae Jong-hyeop confirmed for 'In Your Brilliant Season']. Sports Kyunghyang (in Korean). Retrieved November 21, 2025.
123456프로그램 소개[Program Introduction]. iMBC (in Korean). Retrieved February 20, 2026.
12345Kim, Ji-hye (October 1, 2025). 이성경·채종협 로맨스 '찬란한 너의 계절에', 이미숙→강석우 합류[Lee Sung-kyung and Chae Jong-hyeop's romance 'In Your Brilliant Season', Lee Mi-sook → Oh Ye-ju joins]. Herald Pop (in Korean). Retrieved November 21, 2025.
↑Son Bong-seok (January 13, 2026). "'뉴네임' 김태영, '찬란한 너의 계절에'로 작품 데뷔!"[[New Name] Kim Tae-young makes his acting debut with "In Your Radiant Season"]. Sports Kyunghyang (in Korean). Retrieved January 14, 2026.
123Yoo, Jeong-min (January 13, 2026). MBC '찬란한 너의 계절에' 이성경·채종협, 대본리딩부터 번진 '찬란 케미'[MBC's In Your Radiant Season stars Lee Sung-kyung and Chae Jong-hyeop, their splendid chemistry sparking from the script reading]. iMBC (in Korean). Retrieved January 13, 2026.
123"찬란한 너의 계절에 등장인물"[Characters in Your Radiant Season]. MBC. Retrieved January 21, 2026.
12Kim, Ji-hye (September 9, 2025). [단독] '용원게이' 장용원, '예필' 하차 후... '찬란한 너의 계절에'로 본업 행보[Exclusive: Jang Yong-won, aka Yongwon Gay, returns to his main career with 'In Your Brilliant Season' after leaving Yepil]. Ilgan Sports (in Korean). Retrieved November 21, 2025.
↑So-jin Park (January 20, 2026). "기현우, '찬란한 너의 계절에' 합류…워너비 비주얼 디자이너 변신"[Ki Hyun-woo joins "In Your Radiant Season"… transforms into a wannabe visual designer]. MBN Star (in Korean). Retrieved January 20, 2026.
↑Kwon, Oh-seok (November 13, 2025). 팬엔터테인먼트, MBC와 드라마 공급 계약[Pan Entertainment signs drama supply contract with MBC]. Edaily (in Korean). Retrieved November 21, 2025.
↑Kim, Ji-won (July 18, 2023). [단독] 한효주, 2년만에 복귀 차기작 나왔다...'찬란한 너의 계절에' 주인공 캐스팅[Exclusive: Han Hyo-joo returns after two years with her next project... Cast as the female lead in 'In Your Brilliant Season']. Ten Asia (in Korean). Retrieved November 21, 2025.
↑Ahn, Eun-jae (September 1, 2023). 서인국·이성경, 로맨스로 만날까..."'찬란한 너의 계절에' 출연 검토"[Seo In-guk and Lee Sung-kyung to reunite in new romance drama 'In Your Brilliant Season']. News 1 (in Korean). Archived from the original on December 11, 2025. Retrieved November 21, 2025.
↑Park, Seo-yeon (May 30, 2025). 채종협, 이성경과 로맨스 호흡 맞출까..."'찬란한 너의 계절에' 제안 받아" [공식입장][Official Statement: Will Chae Jong-hyeop and Lee Sung-kyung star in a romantic drama? "I've accepted an offer for 'In Your Brilliant Season']. My Daily (in Korean). Retrieved November 21, 2025.
↑Jang, Jin-ri (October 25, 2025). [단독]홍석천이 인정한 '보석' 기현우, 지상파 안방 데뷔...'찬란한 너의 계절에' 합류[Ki Hyun-woo, a gem recognized by Hong Seok-cheon, makes his terrestrial home screen debut and joins 'In Your Brilliant Season']. SPOTV (in Korean). Retrieved November 21, 2025.
