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Since a Smartphone became a daily necessity, people use Smartphones at any time, and anywhere. Always, Smartphone users can be found killing their time with adorable Smartphone while they wait for subway, bus or friend etc. Since they are totally concentrating on using phone, you can often observe there shaking legs at the same time. “Useful Habit” catch this relationship between two behaviors; Using a Smartphone and shaking legs. This bad habit, shaking legs, can be useful energy maker for Smartphone users.
Seoul, South Korea
Kyungido, South Korea