此事 (cǐ shì): This matter (pronoun) — Meaning & Stroke Order

He need not apologize for this matter, as the fault was not his at all.

Given the seriousness of the situation, the mayor decided to personally concern himself with this matter.

He did not conclude the matter; instead, he further intensified the conflict.

I do not have a deep friendship with him, so it is inappropriate for me to get involved in this matter.

He does not regret this matter; on the contrary, he considers it a relief.