Episode 1

S01 E01 • Friday, Feb 20, 2026 • Feb 20 • 1h 9m

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

Episode 2

S01 E02 • Saturday, Feb 21, 2026 • Feb 21 • 1h 7m

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

Episode 3

S01 E03 • Friday, Feb 27, 2026 • Feb 27 • 1h 7m

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

Episode 4

S01 E04 • Saturday, Feb 28, 2026 • Feb 28 • 1h 8m

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

Episode 5

S01 E05 • Friday, Mar 6, 2026 • Mar 6 • 1h 12m

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.

Episode 6

S01 E06 • Friday, Mar 13, 2026 • Mar 13 • 1h 8m

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.

Episode 7

S01 E07 • Saturday, Mar 14, 2026 • Mar 14 • 1h 12m

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

Episode 8

S01 E08 • Friday, Mar 20, 2026 • Mar 20 • 1h 5m

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.

Episode 9

S01 E09 • Saturday, Mar 21, 2026 • Mar 21 • 1h 8m

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.

Episode 10

S01 E10 • Friday, Mar 27, 2026 • Mar 27 • 1h 5m

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.

Episode 11

S01 E11 • Saturday, Mar 28, 2026 • Mar 28 • 1h 7m

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.

Episode 12

S01 E12 • Friday, Apr 3, 2026 • Apr 3 • 1h 11m