惹

A phono-semantic compound composed of:

心 — semantic component meaning “heart; emotion”;

若 — phonetic component indicating the sound (야 / rě). The character conveys the idea of affecting emotions or stirring feelings, leading to meanings like provoking or causing something.
Semantic development: - to affect emotions; - to provoke or irritate; - to cause or bring about (often negative situations); - to attract attention.

야기 (惹起) — to cause; to bring about

This is a formal expression used in contexts like problems, conflicts, or incidents.

惹 often carries a nuance of unintentionally causing trouble or emotional reaction. In modern Chinese, it is widely used in colloquial expressions, especially involving conflict, annoyance, or attention.
Related characters: 引 — to pull; to lead

起 — to rise; to cause

招 — to invite; to bring about