Heeeey

By what specifically?

He's a regressor but only Kiyoung knows that (Hyunsung didn't know that Kiyoung knows). If you're talking about why he asked Kiyoung for help to not make Charlotte the Empress, it's because they've been close friends in the first life. He saw how Charlotte became devastated after she became the empress.

Ah OK, I was asking cause some people were shitting on Hyunsung, and I thought there was more context.