台Taivo A Taiwan Mandarin dictionary

當局者迷，旁觀者清

dāngjúzhěmí,pángguānzhěqīng

ㄉㄤㄐㄩˊ ㄓㄜˇ ㄇㄧˊ , ㄆㄤˊ ㄍㄨㄢㄓㄜˇ ㄑㄧㄥ

Simplified 当局者迷，旁观者清

1(idiom) an outsider can see things more clearly or objectively than those involved

Keep 當局者迷，旁觀者清 and it comes back until you know it.