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.
Seven years after a lab explosion, Chan returns home for work and unexpectedly meets Haran again.
Chan sees that Haran is frozen in winter and suggests a three-month trial friendship.
Haran rejects Chan's three-month friendship offer, but Chan is undeterred.
As Chan and Haran grow closer, a mysterious sound begins to haunt him, revealing gaps in his memory.
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.
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.
Chan and Ha-ran reunite after his U.S. return. At a SHIM party, their bond grows while Chan starts recording his resurfacing memories.
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.
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.
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.
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.
Lee Sung-kyung
Song Ha-ran
Chae Jong-hyeop
Sunwoo Chan
Han Ji-hyeon
Song Ha-yeong
Kwon Hyuk
Yeon Tae-seok
Oh Ye-ju
Song Ha-dam
Kim Tae-young
Cha Yu-gyeom
Lee Mi-sook
Kim Na-na
Kang Seok-woo
Park Man-jae
Jung Hae-kyun
Sunwoo Seok
Kang Ae-sim
Kim Seon
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