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Jin Woo learns from Mi Hee that Jun Sang is his son. Jun Sang has the aftereffects of a car accident, and his life is in danger if he does not get surgery, but he hesitates. Jun Sang meets Yu Jin for the last time and feels despair that she goes to study abroad. Jun Sang goes to the U.S. for surgery, and Sang Hyuk tells Yu Jin about it. But Yu Jin understands how Jun Sang feels about leaving her, and she decides to move on.

Yu Jin goes to Jun Sang's home. She meets Kang Mi Hee and hears that she and Jun Sang are siblings. Then she goes to Marcian to meet Jun Sang. Jun Sang, who decided to break up with Yu Jin, gives her the cold shoulder. Yu Jin knows how heartbreaking it is for Jun Sang to try to break up with Yu Jin, hiding that they are a brother and sister, so she also decides to break up with him. Jin Woo goes to the hospital when Jun Sang collapses and thinks that Jun Sang might be his son.

Jun Sang and Yu Jin, the two of them alone, get married. When Sang Hyuk, who knows everything about Jun Sang and Yu Jin, comes, Jun Sang is frustrated. Knowing the heartbreaking fate of the two, Sang Hyuk has a hard time since he cannot help them or make them apart. Jun Sang questions himself if he should give in to fate.

Yu Jin and Jun Sang decide to get married and go to Chuncheon to get permission from Yu Jin's mother. Her mother finds out that Jun Sang is Kang Mi Hee's son. She doesn't allow them to get married by explaining the relationship between Mi Hee and Hyun Soo. After learning about the past between their parents, Yu Jin and Jun Sang are distressed, but they decide to endure and wait until they can still be allowed.

Yu Jin and Jun Sang are happy, but he is anxious about some memories that keep coming up. Jun Sang finds out that the memory is about his father. He doubts who his father is but tries to forget it because he is so happy now. Meanwhile, Sang Hyuk tells Jin Woo that Min Hyung is Jun Sang, and Jin Woo thinks Jun Sang might be his son. However, when he meets Jun Sang, he thinks Jun Sang could be Hyun Soo's son, not his son.

Jun Sang has some of his memories back. When Sang Hyuk finds it out, he decides not to marry Yu Jin and lets her go. Yu Jin and Jun Sang have a happy time for the first time in ten years. One day, Yu Jin goes with Jun Sang to meet her high school teacher. When she and Jun Sang arrive, they find all their friends there. Yong Guk says he does not consider Jun Sang as his friend. Jun Sang is hurt by that. Jun Sang and Yu Jin go to Chuncheon to find his memories.

When Yu Jin realizes Min Hyung is Jun Sang, she does not want him to leave, but he decides to leave her for good. Yu Jin goes after Min Hyung, but he gets into a car accident to save Yu Jin.

Min Hyung tells Yu Jin that he is Jun-sang, but she cannot believe that. Yu Jin thinks Min Hyung only wants to be Jun Sang because he can't forget her. So, Yu Jin tries to get away from him. As Min Hyung finds pieces of his past living as Jun Sang, it makes him sad that Yu Jin is a big part of his past, although he cannot remember. Min Hyung decides to leave Yu Jin, thinking he can't stay by her side unless he can remember his past.

Min Hyung goes to Jun Sang's house. He runs into his mother there and discovers that he is Jun Sang. However, Sang Hyuk comes to Min Hyung, who has a hard time because he can't remember. Sang Hyuk calls him Jun Sang and asks him not to get close to Yu Jin. Min Hyung joins the friends' gathering and tells Yu Jin that he is Jun-sang. However, she does not believe him, only looking at him sadly. In despair, Min Hyung decides to leave the U.S. and meets Yu Jin again at the ski resort.

On the day of Kang Mi Hee's performance, Sang Hyuk visits Mi Hee for an interview and finds out that his father and Mi Hee are high school friends. He also overhears Jun Sang might be Mi Hee's son. Min Hyung thinks that his memory is strange and something is wrong. Yu Jin tells Sang Hyuk that Min Hyung is Mi Hee's son. Sang Hyuk goes to the high school and sees Jun Sang's student records. And he finds out that Jun Sang is Kang Mi Hee's son.

When Yu Jin realizes she loves Min Hyung, she breaks up with Sang Hyuk. Everyone is against her decision, but she thinks she is happy and will stand it. Sang Hyuk is heartbroken from the breakup, and his friends convince her to be back to Sang Hyuk. Yu Jin is so worried about Sang Hyuk, but she doesn't want to meet him because she can't leave Snag Hyuk if she sees him having a hard time. However, Min Hyung knows that Yu Jin is having a hard time because of Sang Hyuk and decides to let her go.

Kang Mi Hee goes to Jun Sang's house in Chuncheon and thinks of the past before having her solo recital. Meanwhile, Yu Jin tells Sang Hyuk she can't marry. She also tells Min Hyung she can't be with him. Sang Hyuk tries to get Yu Jin back at all costs. When Sang Hyuk comes to the ski resort for the concert, he goes to Min Hyung and warns him not to confuse Yu Jin. Then, he invites his parents, Yu Jin's mother, and friends to announce the marriage that he has decided on his own.

Sang Hyuk goes to the cabin to find Yu Jin. He sees Min Hyung asking Yu Jin who she loves, but she doesn't answer. Sang Hyuk returns to Seoul alone. Yu Jin visits him later, but he gives her the cold shoulder. On Sang Hyuk's mother's birthday, Yu Jin goes to Sang Hyuk's house to make it up to him, but his mother is not welcome her. Sang Hyuk gets upset with his mother, who is mean to Yu Jin, and leaves with Yu Jin. Out of anxiety and jealousy, he tries to spend the night with Yu Jin.

Yu Jin is injured to save Min Hyung, and Sang Hyuk is upset with her for doing that. Min Hyung tells Chae Rin, who lied to him, that he wants to be alone for a while. Yu Jin hurries to Chuncheon when she hears her mother is sick, and Min Hyung goes with her. They go to the lake where she went with Jun Sang. Yu Jin and Jun Sang are stuck in the cabin on the mountain when the aerial tramway is shut down because of the strong wind.

Min Hyung has no choice but brings drunk Yu Jin to his hotel room. Yu Jin calls him Jun Sang there. As Yu Jin and Min Hyung misunderstand each other more, they give cold shoulders to each other. When they argue, Chae Rin comes. Chae Rin feels something happened between them, and she makes Min Hyung misunderstand Yu Jin more. However, Min Hyung eventually finds out that everything Chae Rin said is a lie and goes to apologize to Yu Jin.

Sang Hyuk is upset that Yu Jin and Min Hyung work together, but he cannot tell her to quit. Chae Rin gets anxious that Yu Jin works with Min Hyung. So, she lies to Min Hyung that Yu Jin has done everything Chae Rin does to make Yu Jin quit the project. When Chae Rin learns that Yu Jin has to attend an event with Min Hyung, she gives Yu Jin a dress that Min Hyung gave to Chae Rin. Min Hyeong is shocked to see Yu Jin wearing the dress he gave to Chae Rin and is deceived by Chae Rin's lies.

Yu Jin goes to Marcian to give a presentation for a ski resort renovation project, and she meets the director, Lee Min Hyung, who looks like Jun Sang. She cannot tell Sang Hyuk Lee Min Hyung is the director of Marcian. Meanwhile, Chae Rin finds out that Yu Jin works with Min Hyung and goes to Sang-Hyuk, but realizes he doesn't know anything. That evening, Chae Rin and Min Hyung run into Yu Jin and Sang Hyuk at a restaurant. Sang Hyuk finds out that Min Hyung is a person who works with Yu Jin.

On the day of her engagement ceremony with Sang Hyuk, ten years after Jun Sang died in a car accident, she sees a man who looks like Jun Sang. She wanders the streets to find the man, forgetting her engagement ceremony. Yu Jin and Sang Hyuk have their engagement ceremony at their high school. Then, they hang out with Chae Rin, Jin Sook, and Yong Guk. Everyone is surprised when Min Hyung shows up because he looks just like Jun Sang.

Yu Jin gets lost on the mountain she went to with her friends, and Jun Sang tries to find her. Jun Sang finds Yu Jin, who is tired of cold and fear. They fall in love with each other and go on their first date. But the excitement of love doesn't last long. Jun Sang sees the same photo as he has in Yu Jin's home. In that photo, he finds Jun Sang's mother, Sang Hyuk's father, and Yu Jin's father, who was not in Jun Sang's photo. Jun Sang becomes confused about who his biological father is.

Jun-Sang moves to a small town in the country and meets Yoo-Jin in the local high school. They fall in love, but Jun-Sang faces a terrible tragedy and gets killed in a car accident.