Difference between solution and big problem in Korean

해결·큰일이다.

solution — 해결solution
해결 means a solution, or the act of solving a problem. You use it when a problem, worry, or difficult situation is fixed. In Korean, it is often used when talking about solving everyday problems, like at home, school, or while traveling.
How to say solution

big problem — 큰일이다.big problem
큰일이다 means "this is a big problem" or "oh no." People say it when something bad happens or when they are worried about trouble. You can use it in many daily situations, like being late, losing something, or forgetting homework.
How to say big problem

The difference

해결 means solving a problem or the answer to it. 큰일이다 means there is a problem, often before it is fixed.