Difference between work and plan in Korean
일·계획

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.

계획plan
A plan is something you decide to do in the future. In Korean, 계획 means your idea or schedule for what you will do. You can use it when talking about your day, school, shopping, or travel.
The difference
일 is the work or task itself. 계획 is what you decide to do before you do it.