A very spaced-out and slow-tempo girl, Shi Yoon is one of the girls who came abroad from Korea to study the art of Prism Shows at the Pretty Top agency. She is one of the members of the Prism Show unit, PURETTY. She is the all-noticing, thoughtful big sister role of her team. Usually, she is very kind and docile, but she is actually extremely scary when angered. Her best friend in Prizzmy☆ is Karin. Her catchphrase is "Ya~y!"

Three years after the events of "Pretty Rhythm: Aurora Dream," Aira, Mion and Rizumu have grown up and tutor a new group of aspiring idols: Karin, Reina, Mia and Ayami, who form the Prizmmy&#9734;. Teenage girls from Korea, named Somin, Shiyoon, Haein, Chaekyung and Jae Eun (who are the PURETTY), appear as a rival group. 

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Her nationality is South Korean but she was born and raised in Osaka.

The new Pri☆Chan Land amusement park has opened near the Prism Stone shop. It is a semi-virtual world where the mascots of idol teams come to life, and even perform as idols themselves. Park manager Meganii announces the Illuminage tournament, where idols compete to become princesses of each area of Pri☆Chan Land, and at the finale one team will be chosen as Illuminage Queens. With the help of their mascots, Miracle☆Kiratts, Meltic StAr and other teams compete to become the Illuminage Queens.
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(Source: Anime News Network)

PriPara Movie: Minna Atsumare! Prism☆Tours is the film based on and starring the characters from PriPara. The film first began showing in theaters across Japan from March 7th, 2015. The plot focuses on Laala Manaka finding out about Saints' top idol journey, and aside from the PriPara performances, the movie also features the journey of characters across all the Pretty Rhythm series.

At some point in the movie, the characters are given a choice of four doors to go through. At this point, the movie diverges into one of 4 routes depending on what the audience chooses. Each route recaps different aspects of the previous Pretty Rhythm series, mainly reintroducing the different characters and their performances. However, Laala and friends only get a chance to enter one door at a time, meaning the film must be watched four times to view each door choice.
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(Sources: PriPara Wikia and Wikipedia)

The film will compiles Prism Show scenes from all three television anime series.