Nobody Knows

One snowy day, a strange woman passes out at Duk-dol's doorsteps. Duk-dol takes care of her and lives with her like a family. It turns out that she hid her husband at the mill and has been bringing him food every night. Her husband is Gwak Pa-ram, the daegeum(flute) master. Duk-dol comes to love the woman but she goes off to her husband.

Yeong-su and Jeong-ah experience many problems as their budding romance defies the strict rules of the co-ed highschool they attend. After graduation when it looks like they can be free to live their own lives, Yeong-su joins the military and their relationship will never be the same.

Ji-yeong has a biking accident and is aided by a boy who is practicing to become an Olympic marathon runner. The young man falls ill during a practice and is forced to give up his dream due to a previously undiagnosed heart disease. Ji-yeong wants to help him, but her parents don't allow it, so she steals a camera to pawn for the money for the boy's hospital bill.

Yeong-su learns that Jeong-ah, a woman he thought dead, is alive and well but her parents will not allow him to see her because she is engaged to be married. When he does finally meet her, he cannot understand the attitude of his former high school sweetheart, not realizing that she is keeping a secret from him.

Gi-yeon is burdened by her half-brother's insidious gaze, but one day when he enters the bedroom, she decides to run away. Gi-yeon, who comes to Seoul for the first time, is caught by gangsters, but with the help of lightning, she gets out of trouble and lives with him in his apartment. Lightning, a member of a criminal organization, rejects Gi-yeon's pure love and for the sake of money, he makes Saron's regular customers Song Jeon-mu and Gi-yeon live. One day, Ki-yeon finds out that she is having a child of lightning. Lightning coolly shakes off Gi-yeon's hand, begging for her to live with her.

Seung-Hye (female), who has her dream to become a good singer, comes to Seoul and becomes acquainted with Mr. Lee, a bandmaster. Mr. Lee gives her a recommendation letter to introduce her to SeonWoo Kang, a composer. At that time, he intends to retire from pop song world owing to his incurable disease. She is helped by him, and he is also attracted by her beautiful voice to let her become a top class singer. Both love each other. He expedites his death owing to overwork, and finally dies at a hospital in the evening when her recital is held.

Do-hee crashes her motorcycle and ends up in a hospital, where she meets Seon-a—an in-patient battling a rare, incurable bone cancer. They form a tender friendship. Do-hee, moved by Seon-a’s spirit, joins a university mountaineering club and climbs Seorak Mountain, praying for her recovery. Seon-a’s parents care deeply, but her condition continues to worsen.