Meaning:
Literally meaning “in operation,” this term commonly used by Chinese fans refers to the scenario where their idols either have working arrangements or are active on social media. That is, like a business operation, their idols are “open/accessible to the public.”
Example:
A: 你在看什么？
Nǐ zài kàn shénme？
What are you checking out?
B: 易烊千玺刚刚更新了一条微博。
Yìyángqiānxǐ gānggāng gēngxīn le yītiáo wēibó。
Jackson Yee posted a new message on Weibo just now.
A: 爱豆周末还营业，真勤奋。
àidòu zhōumò hái yíngyè，zhēn qínfèn。
Your idol is active on social media even on a weekend. He is diligent.