S01E01 Episode 1
Professor Yoon's couple learns their child has been switched through blood tests after a car accident.
Autumn in My Heart
A heart's first awakening.
S01E09: Episode 9
Jun Seo announces to his family that he will marry Eun Seo, but everyone is against his decision.
Overview
Two men and two women, their relationship begins in tragic fates, and it grows into love, agony, and parting.
Episodes
S01E02 Episode 2
Professor Yoon and Soon Im switch their children, but they only suffer from unfamiliar circumstances.
S01E03 Episode 3
Jun Seo returns to his hometown and looks for Eun Seo. Eun Seo has an unwanted encounter with Tae Seok.
S01E04 Episode 4
Tae Seok is upset with Eun Seo going on a blind date for money and takes her to the beach where Jun Seo comes.
S01E05 Episode 5
Jun Seo feels sorry for Eun Seo growing up in harsh circumstances. Tae Seok's confession bothers him.
S01E06 Episode 6
Yu Mi notices that the feelings between Eun Seo and Jun Seo are more than brother and sister.
S01E07 Episode 7
Jun Seo and Eun Seo decide to stay as brother and sister, but Tae Seok sees her crying in Jun Seo's arms.
S01E08 Episode 8
Jun Seo and Eun Seo go on a trip for just two of them, and Sin Ae exposes their relationship to their parents.
S01E09 Episode 9
Jun Seo announces to his family that he will marry Eun Seo, but everyone is against his decision.
S01E10 Episode 10
Jun Seo feels guilty for Yu Mi's breakdown and changes his mind to stay with her, leaving Eun Seo.
S01E11 Episode 11
Eun Seo lies to Jun Seo that she sees Tae Seok again. Tae Seok knows about it and pretends to be a couple.
S01E12 Episode 12
Eun Seo learns she has leukemia and Tae-Seok begs her asking for a chance to cure her disease.
S01E13 Episode 13
Jun Seo finds out Eun Seo has leukemia, and Eun Seo heads to the hospital with Tae Seok for her treatment.
S01E14 Episode 14
Eun Seo tells Jun Seo to love each other forever, only in their hearts. Soon after she goes into a coma.
S01E15 Episode 15
Eun Seo regains consciousness when Jun Seo comes, and they decide to spend the rest of their time.
S01E16 Episode 16
Yu Mi decides to study abroad, and Tae Seok leaves Jun Seo and Eun Seo together. Eun Seo dies on Jun Seo.
Cast
Song Seung-heon
Yoon Jun Seo
Song Hye-kyo
Yoon Eun Seo / Choi Eun Seo
Won Bin
Han Tae Seok
Han Chae-young
Choi Sin Ae / Yoon Sin Ae
Han Na-na
Shin Yu Mi
Choi Woo-hyuk
Yoon Jun Seo (Young)
Moon Geun-young
Yoon Eun Seo (Young)
Lee Ae-jung
Choi Sin Ae (Young)
Sunwoo Eun-Sook
Im Gyeong Ha
Jeong Dong-hwan
Professor Yoon
Lee Han-wi
Yoon Ji Hwan
Kim Hae-sook
Kim Soon Im
