Bitch X Rich Season 2

They are similar in the sense that there is a hierarchy at school. There is also death involved and they are trying to find the culprit(s). Both are really good shows.

This is a second season to first season which was mainly about....
Baek Je Na is a third-generation conglomerate and a gold spoon of the highest class at Cheongdam International High School. Kim Hye In grew up in poverty and is offered a chance to study at the Cheongdam International High School in exchange for her silence on a murder she witnessed. Cheongdam International High School is a homicide mystery that follows Je Na’s rivalry with Kim Hye In as they are pitted against each other in mental warfare.