Sinb : lawyer, daughter of a ceo

Yerin : retired detective, daughter of a ceo, but her parents already died, shes in a relationship with sinb

Yuju:doctor, will help yerin to find justice for her sister

Heechul : stepdad of sinb, Powerful ceo

DONT TRUST PEOPLE EASILY

Sinb, trying to know what and who the reason why jessica , her sister died

Yerin, getting some revenge for the person/people who killed eunha, her sister

With the help of yuju, heechul, sinb's dad, they will find a way to take their revenge 

They will try to investigate things, 

Will they succeed?