Bigger labels will start the. Second of all the agencies give them Korean lessons everyday based from my experience and they live in a Korean environment where everyone speaks Korean. The amazing Thai K-pop idol speaks four languages and continues to improve in all of them.
After all they often release music in multiple languages too.
While many idols speak two languages there are only a handful. These idols however take it to the next level with most people confusing them as Korean natives due to how fluent they are in the language. The amazing Thai K-pop idol speaks four languages and continues to improve in all of them. In global K-Pop market not only English but also other languages like Chinese Japanese Spanish and French are strongly needed.