Arthit, a beloved Thai superstar known as the “Prince of Smiles,” arrives in Japan on a promotional tour for his latest film. Overwhelmed by work, he secretly slips out of his hotel to enjoy a rare moment of freedom. Relishing the joy of moving about unnoticed, he stumbles upon “Tokiwa,” a quiet traditional sweets shop tucked away in an alley. There, he meets Sakurako Ishida, who gave up her dream of studying abroad to help run her father's shop. This fated encounter sets their once-paused lives in motion once again.
While enjoying a brief moment of freedom, Arthit encounters a lost child in a park. As he helps search for the parents, he’s mistaken for a kidnapper, causing a scene. Struggling with the language barrier, he’s saved by Sakurako, who happens to pass by. As they rejoice in their unexpected reunion, Minami arrives with news of a massive dango order. With the shop’s owner (Sakurako’s father) hospitalized and the order too large to fulfill in a day, Arthit and Sakurako decide to help make the dumplings together.
After making dango together, Arthit and Sakurako begin to warm up to each other. When Sakurako and her friend visit a TV station to deliver the order, they realize it’s the set of the variety show Arthit was supposed to appear on. Arthit, noticing this, hides himself, but someone at the studio claims to have seen him. Meanwhile, Sakurako’s childhood friend and first love, Hayato, shows up at Tokiwa...
Sakurako’s father’s doctor, Hayato, suddenly shows up at Tokiwa to see her. Realizing they were each other’s first love, Sakurako is both happy and shy about their reunion after 20 years. Arthit watches the two with a complicated expression. The next day, thanks to Arthit, Tokiwa is booming with customers. After closing, Arthit heads out into the city but unexpectedly runs into Richard and Kaede, who have been searching for him—prompting him to flee on impulse.
When Hayato invites Sakurako on a date, a twist of fate leads them to visit an amusement park with Arthit and Minami. As Sakurako and Hayato grow closer, reconnecting after 20 years apart, Arthit struggles with his emotions while watching them. Meanwhile, Richard and Kaede track down Arthit’s whereabouts and head to Tokiwa in search of him.
After reading a letter from his manager, who tracked down his whereabouts, Arthit is shaken by the trouble he’s caused. As if resolved, he asks Sakurako to show him around Tokyo. The next day, they explore the city by bike, enjoying the sights and finding comfort in each other’s company. But when Arthit unexpectedly runs into Richard in the streets, thoughts of work come rushing back. His brief moment of freedom comes to an end—as a life-changing decision looms ahead.
Holding onto the memories of his time with Sakurako, Arthit returns to reality and successfully attends the stage greeting for his lead film. After hearing from Richard about his future work, Arthit decides with resolve that he will “no longer run away.” Meanwhile, inspired by her encounter with Arthit, Sakurako makes up her mind to pursue her dreams once again and begins studying English. As she spends light-hearted moments with Hayato, the two gradually grow closer.
Sakurako starts dating Hayato, but when her father Toshio pressures her to get married, they end up in an argument. Meanwhile, Arthit continues expanding his career in Japan, working not only on movie events but also commercials. Though he throws himself into work, his smile sometimes fades in unguarded moments. Busy with work, love, and studying English, Sakurako happens to see Arthit on TV and finally discovers his true identity…
Arthit turned out to be a huge star in Thailand! Despite spending so much time together, Sakurako had no idea. Shocked by how different their worlds are, she feels overwhelmed. To cheer her up, Minami suggests they go to an event to see Arthit. While enjoying the event, both girls are filled with mixed emotions as they watch Arthit shine as the “Prince of Smiles.” And then… the long-awaited reunion finally happens.
Sakurako's father safely returns home from the hospital, and daily life at Tokiwa resumes. Though her relationship with Hayato seems to be going well, Sakurako appears distant and preoccupied. When her father hints at marriage with Hayato, Sakurako finds herself emotionally unprepared. Meanwhile, Arthit lands a major job and reaffirms his determination to live as a star. But in an unguarded moment, he comes across a photo of himself with Sakurako—something his manager, Richard, quietly notices...
After arguing with her father and storming out of the house, Sakurako thought she had freed herself from all constraints. However, a single remark from Minami lingers in her heart. Her life, her dreams, her love… As clarity returns, Sakurako begins to truly confront herself. Meanwhile, Arthit finishes his work in Japan and prepares to return to Thailand. During his final interview, memories of his time in Japan flood back, prompting him to speak his true feelings.
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