Learn what "this is a flawless plan it cannot fail" means, when people say it, and how to use it naturally in English.

It means the speaker strongly believes the plan will succeed.
From In Love With My Godfather's Daughter, Episode 27
Someone confidently declares that a plan is perfect and cannot fail.
Use this when expressing strong confidence in a plan. It can sound overconfident or unrealistic if the situation is uncertain.
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