<iframe style="max-width: 100%;" width="560" height="315" src="//www.youtube.com/embed/KW-w6MuNEBw" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""> </iframe>

참 신기하게 봤네요. 혼자서 다 하다니.

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그런데

<iframe style="max-width: 100%;" width="560" height="315" src="//www.youtube.com/embed/L7bF13T-N0U" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""> </iframe>

한국도 비슷한 게 있었군요..........ㅡ,.ㅡ;;;