一个人走到终点不小心回到原点
[yī gè rén zŏu dào zhōng diăn bù xiăo xīn huí dào yuán diăn]
Conveys a journey, literal or metaphorical, of striving to achieve some endpoint in life but ultimately finding oneself back at square one unexpectedly. It suggests themes of circularity in life, possibly frustration or a fresh start perspective.