劝纣回头
[quàn zhòu huí tóu]
This name references Chinese history. 'Zhou' (纣) refers to King Zhou of Shang, an archetypal tyrant king in ancient China known for his depraved rule. So this idiom means trying to persuade evil people or stubborn persons to return to the right path - it's about redeeming others, even the most wicked, hoping for their change for better.