Deus wasn't heartless enough to allow the three alien students to die against Haize. Not to mention, Deus had recognized Shirley's appearance!
Deus remembered that it was thanks to Shirley's money that he was able to learn about Taimu's secret identity as early as possible. But that wasn't the only reason why he decided to help Shirley and her classmates.
It was because he found out about Shirley's identity through his Information Broker system feature. He found out that Shirley's true identity was the first princess of Planet Solaris.
But that wasn't also the reason why Deus decided to help Shirley. It was because Shirley had the same surname as his girlfriend. And from what he had known from his Information Broker feature, Taimu was Shirley's older sister.
So if Taimu and he confirmed their relationship after accepting each other's identity, wouldn't Shirley become his sister-in-law?
