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URLs
- https://www.pixiv.net/users/118806
- https://www.pixiv.net/stacc/heisen86
- https://twitter.com/badbearart
- https://twitter.com/intent/user?user_id=3011642214
- https://www.artstation.com/badbear
- https://www.facebook.com/sanghun.in.3
- https://www.instagram.com/bad_bear_art/
- http://blog.naver.com/heisen86
- https://drawcrowd.com/heisen86
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