<연출 - PERFORMANCE>

<해법 - EXPLANATION>

<YOUKU>

PERFORMANCE https://v.youku.com/v_show/id_XNDExNTk4NTM5Mg==.html?spm=a2hzp.8244740.0.0
EXPLANATION https://v.youku.com/v_show/id_XNDExNTk5NjE0MA==.html?spm=a2hzp.8244740.0.0