Shanghai Dragons Communication

I'm curious about their comms. I think most non-all korean teams use English as their primary language but Shanghai is unique with Chinese and Korean players and no EU or American. So do they speak Korean or Chinese or English even as most of the world learns or uses some English?

Also beyond that, I'm curious about people in Korea and China. In the states, it's not uncommon for your average person to know a decent amount of basic Spanish because of the proximity of Mexico, do Korean and Chinese people also end up knowing some of the other regional languages?

From what I heard they speak Chinese but use English when needed. The KR squad is taking Chinese, Mandarin I assume, lessons and the plan is to transition to fully calling in Chinese.

Not sure if they'll stick to it or possibly adopt some type of hybrid system like some of the Western teams that have several Koreans.

From an interview with their coach, main Chinese with some English for now with an emphasis of no Korean, transitioning to Chinese only - https://twitter.com/tisrobin311/status/982627944555151360