In Yu-Gi-Oh, but Mechanical Ascension (1-148).

Summary

You Feng admires the president's style during a celebratory fireworks display but is puzzled when he sees Kaiba Seto's name featured in the fireworks. After returning to Domino City, You Feng receives a reward for winning the Duel City Championship: a pack of Xyz cards. Although he can’t use them yet, he contemplates sharing the technology to speed up progress. He opens the pack and obtains two powerful cards, Electronic Dragon - Nova and Electronic Dragon - Infinity, but learns they won’t be usable for 5-10 years. Frustrated, he decides to use his D-Wheel, which unexpectedly transports him into the future, specifically to the timeline of 'Yu-Gi-Oh! GX.' He is tasked with becoming a professor at Duel Academy. As he arrives, his D-Wheel malfunctions and crashes near a young boy, who turns out to be You Cheng Shi Dai. The chapter ends with You Cheng Shi Dai asking You Feng for help.

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