ㄖㄨˊㄧㄥˇㄙㄨㄟˊㄒㄧㄥˊrúyǐngsuíxíng

如影随形
  1. 好像影子緊跟形體一般比喻關係非常密切無法分離如影相隨」。

as the shadow follows the body (idiom)​, closely associated with each other, to follow relentlessly