Kwon jiyong a.k.a GD is someone fierce hard alive Dan, he regularly involved with gangsterism, illegal racing and gambling . his life, in surround luxury but he make decision to live like average person. he owns a sister that is 5 years old . His parent work as forensics doctor in seoul hospital . but undesirable thing happened when the occurrence of malicious nature, which caused his parents die. 2 months later "oppa, where are you going?" Sara asks . Sara a little girl that is cute, strong and pampered, he is only source for jiyong life . jiyong squats and hugs his younger sister "oppa, want to go school, why?" , Sara hugs jiyong relatively strong and cry . "oppa, don't leave me . (hic hic)" . jiyong strains his younger sister embrace and pat her hair . "shhhh, oppa will not leave you behind " and then jiyong hug her return . "promise?" Sarah lifts his head . "promise" jiyong smiles and kisses her forehead "jiyong what time now? , you better fast or your want me to kick you!!" . jiyong look towards the voice, "okay, grandma" and she look at Sara ."bye, Sara . "see you later," jiyong kisses Sara's forehead " I will go now , take care " while waving his hand to his grandma and little sister. after his parents' death, jiyong and Sara lives with his grandmother . all the property his parent belong , has been taken by their uncle namely sun Kwon . "Sun Kwon. tchkk . tchkk . you messed with the wrong person" . jiyong look up to the sky "Mother , father i promise , i will find Who your killer" yes . I will find them no matter what it take