LG has argued that the phrase was made based on the result of a test carried out by an accredited institute through objective methods.

The court on Wednesday ruled in favor of the Korean company.

"The advertisement appears to have cited the test result measured by objective means," it said. "Also there is no evidence to believe LG had sought to mislead consumers."

It is not the first time the two home appliance makers have engaged in a legal fight. In 2015, LG filed a suit with an Australian court against Dyson for deceptive advertising. The British firm accepted LG's argument and LG dropped the suit.

But it took less than another year for LG to file a fresh suit in Seoul, after Dyson held a press conference during which it performed a demonstration before journalists comparing its product with an LG model.

LG never proceeded with the suit as Dyson apologized and promised not to repeat the mistake. (Yonhap)