Kwon yuri (boy) 25 years old 

Assasin / killer

First child of  lee byung hun (adopt but yuri never know until .... let's see haha)

love to be alone

never communicate with other people except his family

calm , cold , hansome , cool , smart 

Jung Jessica (girl) 21 years old

lee byun hyun second child 

cold , clumsy , lazy 

sarastic 

really loves her family 

have a trauma about pregnancy because her mother die giving birth her

always feel guilty toward her family

Lee Byung hyun (boy) 45 years old

Assasin / killer (Profesional)

very strict and firm because he dont wanna lose a family again

mysterious , have many secret 

Im Yoona (boy) 19 years old

Smart ,hansome , cherrful, love eat 

have trauma of car 

doesnt have parent (killed by assasin but he never know ) (he thing because car accident)

and other cast that will be explain in story 

plese give me a comment to improve hahahaha thanks before