I reread this and still didnt get the relationship matrix. Who is the Jeon and the Hwang? ...

Jeon is the guy who sold soongap to bungchon i think. I think hwang is a place? And to me I assumed they were step siblings but I searched up the term milady and it said "Milady; a term of address used by a servant for the wife of his master."

hwang is a person, his the reason why bongchun father died, & yes they're step siblings

Ohhh ok