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Depicts the story of Sunwoo Chan, who lost his hearing and memory through an accident, and Song Ha Ran who becomes his savior. Sunwoo Chan is a bright and lively animator who works at an American animation studio. Despite his cheerful energy and positive facade, he's a mysterious figure who hides a lot of secrets. Song Ha Ran, the eldest among three siblings and a renowned designer. Her natural artistic sense, creativity, and work ethic have earned her a solid reputation in the industry. While she gets along well with everyone, she secretly hopes to not form any special bonds with anyone.
After their trial ends, Haran learns the truth. Chan has vanished, but discovering his feelings, she goes to find him.
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.
Chan's envy of Su-jin and Ha-ran grows. As Ha-ran celebrates Chan's birthday, she moves past her "winter" while Na-na makes a choice in Chuncheon.
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.
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 and Ha-ran reunite after his U.S. return. At a SHIM party, their bond grows while Chan starts recording his resurfacing memories.
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 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.
As Chan and Ha-ran grow closer, a mysterious sound begins to haunt him, revealing gaps in his memory.
Ha-ran rejects Chan's three-month friendship offer, but Chan is undeterred.
Ha-ran mistakes him for a stalker, but Chan is cleared. Reunited on a new project, he finds her changed and makes a surprising offer.
Seven years after a lab blast changed his life, Chan returns to Korea and unexpectedly meets Ha-ran, a name he'd long buried.