Drama Family Mystery
8.2/10 2026 · 1 Season· 12 Episodes · Completed ·KR

Creator: Jo Sung-hee

Chan lives every day like it is summer vacation. Haran is trapped in a lonely winter. When their forgotten past reunites them, Chan is determined to gift her another spring. Through laughter and tears, they face winter together and reach their spring in this heartwarming romance.

Cast

Lee Sung-kyung
Lee Sung-kyung
Song Ha-ran
Chae Jong-hyeop
Chae Jong-hyeop
Sunwoo Chan
Han Ji-hyeon
Han Ji-hyeon
Song Ha-yeong
Kwon Hyuk
Kwon Hyuk
Yeon Tae-seok
Oh Ye-ju
Oh Ye-ju
Song Ha-dam
Kim Tae-Young
Kim Tae-Young
Cha Yu-gyeom
Lee Mi-sook
Lee Mi-sook
Kim Na-na
Kang Seok-woo
Kang Seok-woo
Park Man-jae
Jung Hae-kyun
Jung Hae-kyun
Sunwoo Seok
Kang Ae-sim
Kang Ae-sim
Kim Seon
Ki Hyun-woo
Ki Hyun-woo
Baek Seung-gyu
Lee Seung-yeon
Lee Seung-yeon
Jeon Pu-reum
Yun Chae-bin
Yun Chae-bin
Kim Sol
Yoon Park
Yoon Park
Yoon Photo
Han Jae-yi
Han Jae-yi
Eun-chan
Park Seong-hyeon
Park Seong-hyeon
Sunwoo Chan (Young)
So I-han
So I-han
Kim Seok-hyeon

Episodes

In Your Radiant Season (2026) S01E01 – Episode 1 S01E01 69m
20 Feb 26
In Your Radiant Season (2026) S01E01 – Episode 1
Seven years after a lab explosion, Chan returns home for work and unexpectedly meets Haran again.
In Your Radiant Season (2026) S01E02 – Episode 2 S01E02 67m
21 Feb 26
In Your Radiant Season (2026) S01E02 – Episode 2
Chan sees that Haran is frozen in winter and suggests a three-month trial friendship.
In Your Radiant Season (2026) S01E03 – Episode 3 S01E03 67m
27 Feb 26
In Your Radiant Season (2026) S01E03 – Episode 3
Haran rejects Chan's three-month friendship offer, but Chan is undeterred.
In Your Radiant Season (2026) S01E04 – Episode 4 S01E04 68m
28 Feb 26
In Your Radiant Season (2026) S01E04 – Episode 4
As Chan and Haran grow closer, a mysterious sound begins to haunt him, revealing gaps in his memory.
In Your Radiant Season (2026) S01E05 – Episode 5 S01E05 72m
6 Mar 26
In Your Radiant Season (2026) S01E05 – Episode 5
Chan and Ha-ran find a Gyeongju escape but a resurfacing memory puts Chan in a brewing storm. Unbeknownst to Ha-ran, Chan is drawn into a brewing storm.
In Your Radiant Season (2026) S01E06 – Episode 6 S01E06 68m
13 Mar 26
In Your Radiant Season (2026) S01E06 – Episode 6
Chan's sudden exit for the U.S. leaves Ha-ran reeling. As longing sets in, the three sisters clash and Na-na faces an unexpected incident.
In Your Radiant Season (2026) S01E07 – Episode 7 S01E07 72m
14 Mar 26
In Your Radiant Season (2026) S01E07 – Episode 7
Chan and Ha-ran reunite after his U.S. return. At a SHIM party, their bond grows while Chan starts recording his resurfacing memories.
In Your Radiant Season (2026) S01E08 – Episode 8 S01E08 65m
20 Mar 26
In Your Radiant Season (2026) S01E08 – Episode 8
Ha-ran helps Chan reveal his father's watch secret. After their reconciliation, Ha-ran wins an award but meets a shocking face at the ceremony.
In Your Radiant Season (2026) S01E09 – Episode 9 S01E09 68m
21 Mar 26
In Your Radiant Season (2026) S01E09 – Episode 9
Chan's unintentional lie about the fountain pen weighs on his conscience. To stay close to Ha-ran, he must decide if the truth is worth the risk.
In Your Radiant Season (2026) S01E10 – Episode 10 S01E10 65m
27 Mar 26
In Your Radiant Season (2026) S01E10 – Episode 10
Chan's envy of Su-jin and Ha-ran grows. As Ha-ran celebrates Chan’s birthday, she moves past her "winter" while Nana makes a choice in Chuncheon.
In Your Radiant Season (2026) S01E11 – Episode 11 S01E11 67m
28 Mar 26
In Your Radiant Season (2026) S01E11 – Episode 11
Ha-ran, who learns Chan's secret from seven years ago through the "1-Inch of Memory" notebook, falls into confusion upon realizing that even the fountain pen was a gift he had prepared.
In Your Radiant Season (2026) S01E12 – Episode 12 S01E12 71m
3 Apr 26
In Your Radiant Season (2026) S01E12 – Episode 12

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