Please read through their warning notice carefully and follow the rules. Thanks for your understanding.
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Original source: http://www.jang-keunsuk.jp/m/notice/2016/10/11143358.html
Thank you for your continuous support for Jang Keun Suk.
We announce here instead of his agency TREE J COMPANY about disrurbing behaviours by some fans.
We JKS official fan club prohibits chasing him in public places, regardless in Korea or Japan, regardless of countries, Japan and Korea.
For the sake of Mr. Jang Keun Suk and you his fans, please refrain from waiting and chasing in public areas.
*Prohibited acts that are seen in public places and transport facilities