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.

Yi-jae travels to her hometown to meet and cast Su-bin. As they spend time together, they share a deep conversation about their past. However, when Su-bin reveals his hidden history, Yi-jae responds with sarcasm, finding him pathetic.

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.

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.

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.

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.

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.

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.

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 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.

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.