bô-siong-kan無相干

to have nothing to do with

to have nothing to do with; to matter little; to be irrelevant

English Wiktionary, “無相干” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%84%A1%E7%9B%B8%E5%B9%B2 · confidence: Medium (Wiktionary)