Woo Su-bin, a new director, wins an award at an international film festival. During his acceptance speech, he thanks his first love for giving him a dream. After the festival, he visits Korea to meet his first love, Joo Yi-jae who wanted to become a director but works as a reporter. During a conversation, Su-bin suggest they make a film together. However, Yi-jae firmly rejects the offer, revealing deep scars he left on her.

During their senior year of high school, Yi-jae is an aspiring amateur filmmaker. Su-bin also decides to become a director after helping Yi-jae and spending time with her. Although Yi-jae wins an award at a youth film festival, her family fails to show up. Only Su-bin is there to celebrate with her, and the two spend time together after the festival, promising to make movies together in the future. However, neither of their families supports their dreams. Many years later, Su-bin returns to Korea and reunites with Yi-jae, and the long-hidden secret behind their separation begins to unfold.

Yi-jae travels to her hometown to meet and cast Su-bin. As they spend time together, they share a deep conversation about their pasts. However, when Su-bin reveals his hidden history, Yi-jae responds with sarcasm, finding him pathetic. Later, Yi-jae discovers she has been betrayed by her long-standing bond. Meanwhile, Yu-geon is struggling to achieve his own success. One day, he runs into Ha-na again on set. After a brief chat, Yu-geon opens her eyes to a whole new experience. Ha-na later visits Yu-geon’s house, where the two begin to form a new bond.

After mulling it over, Yi-jae finally makes a contract with Su-bin, and they move to Bunam to write the script for Gyeongseong Love Song. Working together, Yi-jae’s feelings towards him begin to grow despite herself. Meanwhile, Ha-na protects Yu-geon from Sang-yeon. Sa-rang accidentally finds a man she has dreamed of and makes advances.

After spending a night with Sa-rang, In-wook decides to appear on her show because he wants to keep the relationship with her. Yu-geon saves Ha-na from people putting her down, and they open up about their inner wounds and dreams. Meanwhile, Su-bin and Yi-jae’s relationship grows steadily as their work goes well. However, Su-bin learns from his father what Yi-jae went through because of him.

Su-bin tries to help Yi-jae in every way after learning about her accident. Therefore, when pre-production for Gyeongseong Love Song begins, Su-bin goes on location scouting and Yi-jae stays indoors for the script meeting. However, it makes Yi-jae feel like she is not approved by the crew because of Su-bin’s overprotection. She even overhears colleagues’ insults about her lack of experience. Hence, he decides to show Su-bin her willpower. Meanwhile, Yu-geon gets an unexpected opportunity after arguing with his father about his dream.

Su Bin and Yi Jae reunite to work together on a new project. Upon learning that Yu Geon is now working alongside Soo Hee, Su Bin can't hide a hint of disappointment, while Yi Jae reacts in a way no one expects. Meanwhile, Ha Na is hurt when Yu Geon begins to distance himself from her. Soon after, Ha Na makes a surprising declaration to her mother, Soo Hee.

Filming for Su Bin and Yi Jae’s movie finally begins, but chaos erupts when Soo Hee suddenly shows up on set and causes a scene. The situation escalates to the point where replacing the male lead is even brought up. Meanwhile, Ha Na gives up her rebellion against Soo Hee and decides to renew her contract with her. On the other hand, someone breaks into Su Bin’s empty house late at night and causes a disturbance.

Su Bin gets extremely jealous when Seong Moo appears on set and shows how close he is to Yi Jae. The Gyeongseong Love Song crew decides to go on a retreat, and Seong Moo joins as well. From dodgeball to grilling meat, the competition between Su Bin and Seong Moo gets fierce. Meanwhile, Director Kang decides to leave CEO Ahn after getting badly burned.

News breaks that Su Bin is Ha Na's half-sibling, and reporters flock to the filming location. Due to the scandal, Yi Jae has to handle the movie shoot all by herself. However, the production comes to a halt due to investment issues. Su Bin holds a press conference, and CEO Ahn bursts in to tell the whole truth.

Su Bin tells Yi Jae that he’ll drop out of the movie production so that it can proceed smoothly. Yi Jae convinces CEO Ahn to reconsider firing Su Bin. Yi Jae wants to study film abroad, but she struggles to tell Su Bin about it. Meanwhile, Yu Geon finds out that his dad has only three months to live.

Yi Jae leaves for Montreal to study film in greater depth. Su Bin goes to the airport to stop her, but he misses her. Gyeongseong Love Song gets released successfully, but Su Bin can’t help but feel empty. Two years later, Yi Jae returns, and to Su Bin’s surprise, she suggests making a movie with her.