南辕北辙
HSK 7-9take the opposite direction; go against; act contrary to
Examples
方法南辕北辙
The method is opposite to the goal.
说要省钱却乱花,真是南辕北辙
Saying he wants to save money but spends recklessly, it's contradictory.
这计划和目标南辕北辙
This plan goes against the objective.