Sol had gotten into an accident and had no will to live a life. However, a phone call from Sun-jae, the vocalist of the group Eclipse, gave her hope and comfort. Since that day, she has become Sun-jae's fan

Sol is confused about the situation, but one thing she knows is that she must save Sun-jae. She finds out that she can't directly explain the future. To save Sun-jae, she decides to become friends with him, but it's not easy to become friends

Sun-jae wins the gold medal at the competition and he decides to confess his feelings for Sol. But due to unexpected events, it’s not as easy as it seemed. Sol thinks that she has changed the future, but Sun Jae gets hurt during practice

Sol is back in 2023. She couldn't save Sun-jae, but she found out that she did make some changes in the past. She manages to go back in time again, but things have turned out strangely while she was gone

Sun-jae saves Sol just in time. Sol realizes how precious her life is and tries not to miss out on many things. Tae-sung feels jealous of Sun-jae who seems close to Sol

Sol breaks up with Tae-sung, thinking he only dated her to avoid the girl who likes him. Sun-jae tries to be cool with Sol so he can win her heart, but it’s not easy for him to hide his feelings. Sol tries to avoid her accident that will happen to her in the future

Sol manages to escape from the kidnapper and Sun-jae saves him. At that moment, Sol is back in 2023. She is relieved to know that Sun-jae is safe as well, but a lot of things have changed

Sol and Sun-jae meet at the Hangang Bridge as they promised. Sol is worried that something might happen to Sun-jae if she lets him go. She insists they spend the night together and the two end up going to Sun-jae's place

Sun-jae is attacked again and he’s in a critical condition. Police disclose information on the culprit and Sol notices that the timeline has changed again. She manages to find a way to get back to the past, and this time, she goes to the same college with Sun-jae

Sun-jae tells Sol he will leave for the US for the rehabilitation training. Sol is relieved to hear the news as he’ll be safe in the US, but she feels sad at the same time. In-hyuk asks Sun-jae to join his band and go to the audition together

Sol and Sun-jae decide to be honest with their feelings and enjoy every moment together until Sol goes back to the future. Their parents find out that they are dating, and a small mistake leads to a big misunderstanding. Kim Young-soo is arrested by the police and Sol feels relieved

Kim Young-soo escapes and Sun-jae wants to protect Sol and make her feel relieved. They run into Geum and Hyun-joo and find out about their relationship. In-hyuk goes back to his home in the countryside as he quits the band

Sol lies to Sun-jae and leaves him. Sun-jae comes back to Seoul alone, but he finds out that Sol lied to him. He goes back to find her, but Sol doesn't answer his calls

After Sun-jae and Sol's brief and misunderstood encounter at the award ceremony, Sun-jae is accidentally given the wrong script proposed by Sol. However, upon reading it, Sun-jae becomes inexplicably determined to play a role in it while Sol tries her best not to get mixed up with him. But as things don't go the way she wants them to, Sol even thinks about quitting her job

Sol passes out on the Ferris Wheel and Sun-jae takes her to his place and looks after her. Sol wants to draw a line, but Sun Jae can’t stop having feelings for her. He keeps seeing visions when he’s with Sol, and he wants to know about it

Sun-jae's memory comes back and now he remembers everything that happened between Sol and him. Thanks to Tae-sung, the ill-fated relations are resolved and the couple can be together. Sun-jae wants to propose to Sol, but finding the right time is difficult