Sweet Love In Korea

"My life is full of tragedies. My unfortunate fate, are you ready to make me forget the sorrows of my life?"  He is a boy who since he was 5 years old, his parents have left him. His parents died in an accident and were separated from his older sister. His older sister was deliberately hidden for fear of becoming a big threat to the extended family.  Where this boy was born from a family that is not simple. Not to mention, this boy also has to live a simple life because of his self-awareness of being an adopted child.  Until, he is met by a girl, where this girl is a young Mafia. This girl falls in love with him and tries to cultivate a sense of love for the boy.   What is the love story of the two? Then, can this son fight for the right to his family property, as the real heir?