The story begins when Joon-sang, the son of an eminent musician, moves to Chuncheon, a rural city in South Korea. As an extraordinarily talented student, Joon-sang is welcomed by his fellow students as well as his teachers, but remains a quiet, introverted teenager. As he intends to find out about his biological father, whom his mother claims has died, his search to find out more about his father is what made him want to move to the province. Having an identity crisis in adolescence because of the father he has never met, and blaming his mother for this, Joon-sang believes that no one truly loves him.
On his way to school one day, Joon-sang's classmate Yoo-jin, while sitting next to him on the bus, falls asleep on his shoulder. Joon-sang soon falls in love with Yoo-jin, who opens her innocent heart to him. Their love, however, is cut short after Joon-sang is seriously injured in a car accident and, due to brain damage, suffers from amnesia, unable to remember anything prior to his accident.
Joon-sang's mother, yearning for Joon-sang's love and respect, has Joon-sang brainwashed by a psychologist, so that Joon-sang will not remember his painful childhood as an illegitimate child. As a result, Joon-sang's memories prior to the accident are erased. Joon-sang's mother decides to move to the United States with Joon-sang, where he can start a new life under the identity of Lee Min-hyeong. His friends and teachers are told that Joon-sang is dead.
Ten years later, Min-hyeong is an award-winning architect in the United States. He does not remember anything about his life in Korea. He is completely different, an open-minded person who cares about other people, including his mother. He returns to Korea and Yoo-jin sees him on the street, prompting her to put off her engagement to her childhood friend Sang-hyeok. Little does she know that Min-hyeong is dating her friend and sometime past rival Chae-rin. The story's plot intensifies when Yoo-jin begins to work for the firm where Min-hyeong is employed, and tries to find out if he is her supposedly dead first love Joon-sang.
Bae Yong-joon as Kang Joon-sang / Lee Min-hyeong
Choi Ji-woo as Jeong Yoo-jin
Park Yong-ha as Kim Sang-hyeok
Park Sol-mi as Oh Chae-rin
Lee Hye-eun as Kong Jin-sook
Ryu Seung-soo as Kwon Yong-gook
Kwon Hae-hyo as Kim seonbae
Song Ok-sook as Kang Mi-hee, Joon-sang's mother
Jung Dong-hwan as Kim Jin-woo, Sang-hyeok's father
Kim Hae-sook as Lee Yeong-hee, Yoo-jin's mother
Ha Ji-hye as Jeong Hee-jin, Yoo-Jin's younger sister
Jung Won-joong as Park Jong-ho, "Gargamel"
Jang Hang-sun as Supervisor Min
Lee Hyo-chun as Park Ji-young, Sang-hyeok's mother
Park Hyun-sook as Lee Jeong-ah, Yoo-jin's colleague at Polaris
Son Jong-bum as Yoo-jin's colleague at Polaris
Yoo Yul as Radio broadcaster
Ha Jae-young as Jeong Hyeon-soo, Yoo-jin's father
it was my first korean drama to watch i lke it so much it was romance with alot of crying :D i recomande it for u :D