A girl, she is Kang Ava. Her life was not normal but fine until her mother gets married to a rich businessman who fall in love with her mother. They are the rulers of the underworld.7 demons in human bodies. They are most Merciless mafias. They know nothing but power and money they loved. They are called heartless not for nothing. They were all fine with money and power but what will happen when their 'father' suddenly gets married. And to mention with a beloved daughter. They were forced to act like normal people Infront of the new family members. Secrets are hidden. A new world for both of them. The girl who with her mother traveled to Seoul for the first time. her mother got to marry the richest man in the whole world. What will happen she meet them without knowing they are mafia. And will she be able to take her revenge? As she has thought. Will it be possible according to her, you want to know? let's see would you like to join her on her journey trip? "This bitch of a sister is really getting my nerve. Should we kill her?" "She is doing something to us. I feel home alive inside my heart Brother" "We should protect her” "SHE IS OUR SISTER!" I was a monster before, in whose life there was no light, only if it was just darkness, there is no reason to live, no fear of dying, there was a desire to die but that too could never be fulfilled. but one day her life will change, she herself did not even know that she will have the courage to live, her life will change. But she did not stay happy for long, again darkness came in her life, but this time along with the darkness, the fire of revenge took birth inside her. hidden dark secrets, she was a bath in black water, black blood is running through in her veins, she blessed by Satan, an untamed monster, the monster that was hidden somewhere inside has now come out again, and this time it will not leave its prey. She lives with her a nightmare every second, a new family entering her dark life, what new change her life in the better or worse way and a storm ready to snatch their happiness again, what she never imagined, "Touch our sister your soul finds your dead body next to us", meet with them is Blessing me and biggest regret in my life, they gave me love happiness again in my life, I've been craving for a long time, they become my light in my dark world, but they also become my nightmare again, and they become also fuel in fire my life, but soon "I would regret meeting them so badly" you want to know. let's see would you like to join her on her journey trip?