Winter Sonata - Season 1 (2002)

You-jin and Min-hyung work together in renovating a ski resort. Although You-jin tries to hide that she's working with Min-hyung, Sang-hyuk soon finds out.

Sang-hyun is unhappy that You-jin is working with Min-hyung but realizes that he cannot make her quit the work. When Chae-rin finds out that You-jin and her boyfriend work together, she feels threatened and makes up lies about her to Min-hyung.

Min-hyung takes the drunk You-jin to his hotel room and is surprised when she calls him "Jun-sang". The misunderstanding between the two deepens and Chae-rin sets fire to Min-hyung's anger towards You-jin.

You-jin is injured while trying to save Min-hyung, and her boyfriend Sang-hyuk is infuriated. When Min-hyung realizes that his girlfriend Chae-rin lied to him about You-jin, he asks her for some space in their relationship. Min-hyung and You-jin go together to a pond where she shared beautiful memories with Jun-sang when they were in high school.

Min-hyung and You-jin spend the night at the ski resort and Sang-hyuk and Chae-rin wait for them anxiously. The next morning, Sang-hyuk questions You-jin whether she truly loves him. When she is unable to answer him, Sang-hyuk coldly turns away from her.

You-jin tells Sang-hyuk that she cannot marry him, and at the same time, she assures Min-hyung that she cannot have a relationship with him. She begs Sang-hyuk to give her a chance to stand on her own. Sang-hyuk does everything he can to change her mind, while stepping up to Min-hyung and warning him to not shake her heart.

You-jin finally breaks up with Sang-hyuk when she realizes that she is completely in love with Min-hyung. Although everybody around her opposes her love, she tells herself that she can be happy as long as she is with Min-hyung. Meanwhile, Sang-hyuk refuses to eat or sleep.

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Min-hyung goes to Jun-sang's old house and meets Kang Mi-hee. Mi-hee assures him that Min-hyung is actually Jun-sang. Sang-hyuk calls Min-hyung as Jun-sang and warns him to stay away from You-jin. Meanwhile, Min-hyung takes You-jin to his car by force, and tells her that he is Jun-sang. Unable to believe his words, You-jin only looks into his eyes with sad tears.

Despite Min-hyung's confession that he is Jun-sang, You-jin does not believe him, thinking that he is only doing that to get her back. Meanwhile, seeing You-jin even in his missing pieces of memories, Min-hyung sadly sheds tears. Min-hyung decides to leave as he realizes that as long as he cannot fully remember his past, he can no longer linger around You-jin.

When You-jin finds out that Min-hyung is Jun-sang, she desperately runs out to find him and stop him from leaving. During her attempt, she nearly gets into a car accident, and Min-hyung jumps in and gets hurt instead.

Jun-sang recovers his lost memories partially, and shares them with You-jin. Although You-jin and Jun-sang spend a happy time together for the first time in ten years, they both have heavy hearts as they are unable to erase the pain they have caused their friends.

Jun-sang and You-jin finally make up with their friend. One day, Jun-sang realizes that the last missing piece of his memories concerns his father. Meanwhile, when Jin-woo hears that Min-hyung is Jun-sang, he cannot help but question whether Min-hyung is his long lost son.

You-jin and Jun-sang decide to get married and head for Chuncheon to her mother's house to get her approval. However, when You-jin's mother finds out that Jun-sang is Mi-hee's son, she firmly disapproves of them getting married.

Unable to change You-jin's mother's mind, You-jin and Jun-sang decide to have a secret wedding by themselves. However, their plan is shattered when Sang-hyuk chases after them.

You-jin discovers a shocking secret from Kang Mi-hee. Meanwhile, Jun-sang treats You-jin coldly, knowing that he should cut ties with her. Realizing how difficult it must be for him, You-jin suggests to Jun-sang that they go their separate ways.

Jin-woo finds out that Jun-sang is his lost son. Jun-sang hears shocking news from the doctor that unless he undergoes brain surgery, he will have a very slim chance of living due to the aftermath of his car accident.