Tensions Grow Between South Korea and China Over President Yoon’s Taiwan Remarks

President Yoon did not even mention anything about the One China Policy, only that the status quo should stay in place with Taiwan, in other words he does not want a major war in the region. For China advocating against a major war in the region is considered meddling:

The foreign ministry strongly denounced China for committing a “serious diplomatic discourtesy” Thursday after a Chinese official branded President Yoon Suk Yeol’s recent comments on Taiwan as a verbal meddling by others. 

The ministry issued the statement after the Chinese foreign ministry’s spokesperson, Wang Wenbin, said earlier in the day Beijing would not allow others to meddle by word, in reference to Yoon’s media interview the previous day in which he expressed opposition to any change in the status quo of the Taiwan Strait by force. 

Wang also called on Seoul to adhere to the “One China” policy under the spirit of the establishment of diplomatic relations between the two countries, saying solving the Taiwan issue is solely a matter of China’s own affairs. 

Seoul’s foreign ministry said Wang’s comments were “unspeakable.” 

Yonhap

You can read more at the link, but it is pretty clear that China is trying to send a message to South Korea that war with Taiwan is coming and they better stay out of it.