Sun-jae's father and Sung-chun are like brothers. Sun-jae's father was murdered by Sung-chun in 1975 before Sun-jae was born. Sung-chun's involvement in the murder was covered up. In 1985 immediately after Sung-chun's wife dies, Sung-chun has Sun-jae and his mother move in with him and his children (Min-chul and Minji). Sung-chun tells everyone Sun-jae is his real son, but in actuality he is not. Min-chul and Minji hate their father, Sun-jae and Sun-jae's mother. Sun-jae meets Yonsoo and Sena while visiting Grace Home (an orphanage). Yonsoo is touched by Sun-jae's kindness. Yonsoo accidentally burns Sena with hot water and is guilt-ridden. In 1995, Yonsoo leaves Sena at the orphanage to look for a job and earn money so that Sena can join her later. She promises to meet Sena at the Seoul Tower on Christmas Day.
レコード会社の御曹司ミンチョルは、父と継母、そして異母兄弟のソンジェに憎悪を抱きながら育った。しかし、そんな兄弟は、ともに一人の女性ヨンスを愛するようになる。両親を亡くし施設で育ったヨンスは、施設で姉妹同然のように一緒に育ったセナと離れ離れに。ヨンスは、セナを探すため、レコードショップで働くことに。そこで、ミンチョルと出会い・・・。
心に傷を負いながらも運命に導かれて出会った4人の若者たちが、互いに愛し合い、時に傷つけあいながらも、自分の夢を求めていく「美しい日々」を描いた極上のラブストーリー
