You're young again. You're at an age full of dreams and hope. What's your dream now that you're young again?
18 Again
At a difficult place in his marriage and career, a middle-aged man gets a shot at a do-over when he's transformed back into his 18-year-old body.
Episodes
At a crucial basketball game in which he must prove his skills in front of Hanguk University scout, Dae Young chooses what’s best for both him and Da Jung. After 18 years, he’s on the verge of getting divorced. Just before he’s about to give up, he hopes for a miracle. Believe it or not, he finds himself with the body of an 18-year-old kid.
As 18-year-old Hong Dae Young, Ko Woo Young realizes that his children are living a life that he wasn’t aware of, and he decides to encourage them as a friend. In the meantime, Da Jung goes through blind recruitment at JBC. While having a night out with Ae Rin, Da Jung comes across Choi Il Gwon, a high school friend. On their way back home, Da Jung sees Woo Young whose appearance seems to overlap with that of Dae Young’s.
Da Jung gets a phone call from JBC regarding the results of the open recruitment. Meanwhile, Woo Young picks a fight with Ja Sung when he just won’t stop bullying Si Woo. On her first day at JBC, the fact that she is married dissatisfies the higher ups, resulting in a clearly biased treatment towards Da Jung. Later on, Da Jung gets a chance for an interview with only a few minutes left before going live.
At a team dinner with the baseball team, Ji Hoon requests the director to schedule Da Jung for his upcoming interview. Meanwhile, Si Ah is taken to a nearby hospital, which worries everyone around her, especially Woo Young. Ironically, Da Jung is again disappointed by Dae Young’s reaction to Si Ah’s condition. On top of it, Da Jung hates the fact that Dae Young is lying to her about his business trip to Busan.
Dae Young wants to know why Da Jung wants to get divorced. However, Dae Young can’t get the answer from her as Woo Young. Dae Young finds out that Il Gwon is seeing his first love, and he suspects that Il Gwon and Da Jung are having an affair. Meanwhile, Da Jung gets public attention with her interview video.
Dae Young is bothered by Ji Hoon who tries to get close to Da Jung. Da Jung’s divorce gets public, and she loses her programs due to public opinions. Ji Hoon takes Da Jung to the field to comfort her, and Il Gwon gives up on seducing Da Jung. Meanwhile, Dae Young finds out that his father has been taking care of his children and Da Jung.
When Deok Jin envies the fact that Dae Young has become young again, Woo Young carelessly blurts out his true identity. Ae Rin, who happens to be right next to them while waiting for Da Jung, hears their conversation. Meanwhile, Il Gwon asks Da Jung for an inappropriate favour as Si Woo’s basketball coach. Thanks to Woo Young’s advice, Da Jung does the right thing but gets caught doing something that might provoke Il Gwon.
While Woo Young is unsure of the conversation between Da Jung and Il Gwon, he is worried that Da Jung might have found out his true identity. Meanwhile, Da Jung is shocked at what she heard about Dae Young. When Dae Young comes across his father at his mother’s grave, he invites him to his basketball game. After the game, Dae Young pours his heart out.
Da Jung couldn’t turn a blind eye to Il Gwon’s behaviour as a basketball coach and asks for help from the other parents. After catching Il Gwon red-handed with Woo Young’s support, Da Jung and Woo Young realize how they took some things in their lives for granted. Later, Da Jung finds herself feeling somewhat secured whenever Woo Young shares words of comfort.
Woo Young throws himself in front of an oncoming car to save a little girl in danger and is taken to a hospital. Meanwhile, after contemplating the appearance on a divorce-related show, Da Jung decides to accept the offer with full support from her family. As time passes, Woo Young feels the emptiness from being away from his family and rushes to Da Jung.
Woo Young turns around without saying anything after seeing Da Jung smiling with Ji Hoon. Meanwhile, during the school's festival, Ja Sung confesses his feeling to Si Ah, and shortly after, things turn into chaos. Woo Young, who now feels like he has lost both the women in his life and is full of regret, hears drunk Da Jung ask a meaningful question.
Da Jung thinks that what happened between her and Woo Young was just a dream, but she still can’t bring herself to face him. Meanwhile, the rivalry between Woo Young and Ji Hoon gets more heated. While Da Jung feels flustered to think that Woo Young likes her, the three of them meet at Go Go Play’s launch party.
Woo Young kisses Da Jung out of nowhere. Wrapped up in a myriad of thoughts, Da Jung hurriedly distances herself from Woo Young. Later on, although Woo Young tries to give a legitimate explanation for his seemingly rude behaviour, Da Jung cuts him off. Meanwhile, Da Jung realizes that Si Ah wasn’t working at a convenience store just to make extra cash.
With the full-time employment announcement just around the corner, Da Jung gets thrown into confusion after listening to Woo Young's outlandish confession. Woo Young realizes that his confession could've put Da Jung in a difficult position. A few days later, after the full-time employment announcement, Ji Hoon calls Da Jung's ex-husband at the end of a predicament.
Woo Young and Da Jung don’t even remember the last time they went out on a date and decide to go on one. Meanwhile, Woo Young gets a call from a stranger asking for Dae Young. Although Woo Young and Si Woo both get a conditional offer from the Hanguk University basketball team, Woo Young believes that there is something more important to him than his dream as a professional basketball player.
While on her way to Si Woo’s basketball match, Da Jung sees Woo Young in front of the stadium and blames herself for ruining his life again. Meanwhile, a shocking video of Da Jung, which was thought to lead her life into another hardship, brings her all the rewards she deserves. Time flies by and two years later, Dae Young asks Da Jung to join him in a new beginning of their journey together.
