Rating suspected of Lobbying

I am suspicious of ratings on this drama series, that premiered a week ago. 

https://mydramalist.com/58511-sunbae-don-t-put-on-that-lipstick

It was 8.1 and in few hours ratings shoot up to 8.7. 

I suspect it as a lobbying case for being biased towards a certain actor that is a part of drama. 

I request admins to look into it.