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this account post all chpters of heart stain in mandarin, if you scroll down uou can see it
https://m.weibo.cn/u/2903919201?uid=2903919201&luicode=10000011&lfid=231522type%3D1%26amp%3Bt%3D10%26amp%3Bq%3D%23%ED%95%98%ED%8A%B8%20%EC%8A%A4%ED%85%8C%EC%9D%B8%23
scroll up to see the old chapters
scroll up to see the old chapters :)
https://m.weibo.cn/search?containerid=231522type%3D1%26t%3D10%26q%3D%23%ED%95%98%ED%8A%B8%20%EC%8A%A4%ED%85%8C%EC%9D%B8%23&extparam=%23%ED%95%98%ED%8A%B8%20%EC%8A%A4%ED%85%8C%EC%9D%B8%23&luicode=10000011&lfid=1076032903919201