Mimi asked Xing Kelei if there were three mobile phones, which episode was it?

Related stories:

As soon as Xing Kelei finished his actual combat teaching in the simulation training cabin, a group of flight attendants gathered around to ask for Xing Kelei's WeChat. Xing Kelei took out his mobile phone and added WeChat to them. After the flight attendants left, he took out three mobile phones to see if there was any urgent information to check and reply.

Follow-up story:

Afternoon training will begin soon. Mimi asks Shu for leave, and Shu calls Xing Kelei. Xing Kelei didn't answer the phone when he drove back to the base. Shu refused to let go, but there was no way but to leave secretly during training. Mimi just stopped Xing Kelei's car on the side of the road, hoping that Xing Kelei could send her.