如影隨形（如影隨形）　

◎ 如影隨形 rúyǐngsuíxíng

[like the shadow following the person—very closely associated with each other] 像影子老跟著身子。比喻關系親密

如影隨形,雖有非實。——宋· 道原《景德傳燈錄》