incident vs work in Korean
사건vs일

사건incident
This word means an incident or a case that happened. It is often used for something important, unusual, surprising, or sometimes bad. People use 사건 when talking about news, police matters, or a problem that happened somewhere.
When to use incident
일work
Work means the tasks you do for your job or something you need to do. In Korean, 일 can mean your work, your job, or a task. You can use it in simple sentences like having a lot of work, doing work, or finishing work.
When to use workHow they differ
일 is a very broad word. It can mean work, a task, or just something that happened, while 사건 is a more specific incident, often important or problematic.