冤有頭,債有主 (jyun1 jau5 tau4 ,zaai3 jau5 zyu2) — an injustice has a start, a debt has a debtor, which means to understand a situation, one must find the ones who started it first in Cantonese
jyunˉ¹冤jauˏ₅有tauˎ₄頭,,zaai3債jauˏ₅有zyuˊ²主简 冤有头,债有主
Mandarin Pinyin: yuan1 you3 tou2 , zhai4 you3 zhu3
Meaning of 冤有頭,債有主
nounan injustice has a start, a debt has a debtor, which means to understand a situation, one must find the ones who started it first