Season 1

E1. Episode 1

Feb 20, 2026 · 69m

Seven years after a lab explosion, Chan returns home for work and unexpectedly meets Haran again.

E2. Episode 2

Feb 21, 2026 · 67m

Chan sees that Haran is frozen in winter and suggests a three-month trial friendship.

E3. Episode 3

Feb 27, 2026 · 67m

Haran rejects Chan's three-month friendship offer, but Chan is undeterred.

E4. Episode 4

Feb 28, 2026 · 68m

As Chan and Haran grow closer, a mysterious sound begins to haunt him, revealing gaps in his memory.

E5. Episode 5

Mar 6, 2026 · 72m

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.

E6. Episode 6

Mar 13, 2026 · 68m

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.

E7. Episode 7

Mar 14, 2026 · 72m

Chan and Ha-ran reunite after his U.S. return. At a SHIM party, their bond grows while Chan starts recording his resurfacing memories.

E8. Episode 8

Mar 20, 2026 · 65m

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.

E9. Episode 9

Mar 21, 2026 · 68m

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.

E10. Episode 10

Mar 27, 2026 · 65m

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.

E11. Episode 11

Mar 28, 2026 · 67m

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.

E12. Episode 12

Apr 3, 2026 · 71m