School uniforms for Young Blood’s spy school

That school pin looks so familiar. Can anyone pin the source?

Here’s another set of characters for upcoming drama Young Blood 大宋少年志, this time with the leads in school uniforms.    Zhang Xincheng (My Huckleberry Friends), Zhou Yutong (Cambrian Period), Zheng Wei, Wang Youshuo, He Haochen, and Su Xiaotong heads the series set in  a Song-dynasty school for secret agents.  

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