• Luhan shows his school registration in the "Back to School" music video

Luhan shows his school registration in the "Back to School" music video (Photo : You Tube/fyeah!luhan)

Luhan has been officially prohibited from entering Taiwan due to violations relating to visa. Coming to Taiwan with just a tourist visa instead of the required working visa, the Taiwanese immigration office slapped the star with 5-year ban for working illegally within the country's premises.

On May 3, the "Twenty Once Again" actor has ran into a problem with the Taiwanese immigration after filming the reality-variety show "Back to School" in Taiwan without proper visa. Engaging in any type of work without securing a work visa is unlawful and the bureau determined that the former EXO member violated regulations set by the immigration with regards to work permits.

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According to ET today, Luhan will have to wait five years before he can come to Taiwan again. This means, he cannot enter the country, for any purpose, within the 5-year period, however, it was stated by immigration officials that the star can request for work visa after two years.

It was also learned that aside from Luhan, eight other cast and 10 production crew members were also given the same penalty due to filming without valid work permits. In connection with this outcome, the producers apologized and pinned the mistake to their unpreparedness and lack of experience, Soompi reported.

At any rate, although the cast and crew of "Back to School" experienced such difficulty while filming, it was said that the program will still air in June, as scheduled. Season two is going to be broadcast on China's Zhejing Satellite TV.

Meanwhile, Luhan recently went back to South Korea to film the Chinese version of popular variety show "Running Man." He appeared in the program as a fixed member while "Descendants of the Sun" actor Song Joong Ki was a special guest.

Luhan's return to Korea, to shoot the program, was his second time since leaving EXO in 2014. His first visit was in January but the purpose of his visit was not known.

The filming of China's "Hurry Up, Brother" was said to have taken place at a duty free shop in Seoul. Fans are highly anticipating the airing of this episode since two of the hottest Asian stars are featured together.

Watch Luhan and cast sing the theme song of "Back to School":