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The film begins as Gaiark Pollution Ministers attempt to break the dimensional barriers that separate the Braneworlds, recycling 13 Barbaric Machine Beasts to help them out. The Go-ongers intercept the Recycle Barbaric Machine Beast Army in their Engines, managing to scrap the 13. However, trio of mysterious warriors appear and their actions result with the Go-ongers losing the primary Engine Casts while being sucked into the Braneworld known as Samurai World (サムライワールド, Samurai Wārudo), a dimension similar to Edo Japan where power is essential. Attempting to find the missing Engine Casts.

Set at a psychiatric hospital. Soo-Myung (Yeo Jin-Goo) has suffered from schizophrenia due to his guilt that he suffers from his mother's suicide. He meets Seung-Min (Lee Min-Ki) at the psychiatric hospital. Seung-Min has been forcibly hospitalized because of his wealthy family's inheritance fight. Dreaming of getting out of the hospital, Seung-Min constantly tries to escape. Soo-Myung begins to follow Seung-Min.

King Gwanghae (Lee Byung-Hun) has been the King for the past 8 years. He now suspects that someone within the royal court is attempting to poison him. In response, King Gwanghae orders his councilor Heo Gyun (Ryoo Seung-Ryong) to find someone that looks like him to sit in his throne. Heo Gyun then comes across a clown named Ha-Sun (Lee Byung-Hun), who performs lewd shows in front of drunken noblemen. Ha-Sun indeed strongly resembles King Gwanghae and is even able to imitate the way King Gwanghae speaks. Heo Gyun takes Ha-Sun to the royal palace without giving any explanations. At night, Ha-Sun takes the King's seat, while the King slips away to his mistress's home. A short time later, King Gwanghae collapses and is taken to a safe house. Meanwhile, Ha-Sun continues his ruse as the King until the King can recover. Slowly, Ha-Sun's own personality comes out and the people in the King's inner court notice the changes. The King appears more humane to those around him and far less volatile. While Ha-Sun's true voice comes out, enemies within the King's inner circle plan their next move.