Orphaned at birth, Ji Hyeok has struggled to survive for as long as he can remember. He has done everything from being a boxer to working as a street thug. His whole life turns upside down when he suddenly finds himself the son of one of the largest conglomerate families in Korea. In an attempt to save his biological son, Dong Seok, Chairman Kang Sung Wook tries to take Ji Hyeok's heart and give it to Dong Seok. However, in the middle of the transplant surgery, Ji Hyeok miraculously wakes up from anesthesia. When the media catches wind of his existence, Chairman Kang panics and tries to play off Ji Hyeok as his real son. Meanwhile, Dong Seok is forced to go overseas for a heart transplant. When he returns, he immediately seeks out his girlfriend, Mi Ra. However, when he realizes that Mi Ra has developed feelings for Ji Hyeok, he sees red and vows revenge, paving the way for a complicated future for these two men connected by a strange twist of fate.

Geon 的主要工作就是诈骗，非常擅长说谎。他的绰号是黄枪，因为他在后巷混，拳快得就像枪一样。Geon 在失去双亲后前澳洲，对于跟妹妹分开感到非常难过。Ha Neul 以 Park Hye Won 的身分生活在收养她的新家，15 年来一直等着哥哥 Geon。终于等待已久的哥哥出现了，但他却似乎不记得自己是谁。被命运捉弄的兄妹与两位爱着他们的男女之间的纠结爱情故事就此展开。

正浩，宥利，世妍，镇基四人从高中认识以来，已成为朋友 17 年。正浩是个以前拥有诉讼怪物天才外号的房东。 儘管他有些笨拙，但其实他是个散发着神秘气息的酷哥。宥利是个曾经靠着美艳外表赢得韩国小姐称号，有点古灵精怪的四次元律师。她炙热的性格，因为无法为不公讨公道，她离开律师事务所并自己开了家法律咖啡厅。 当她要和房东签约时，才发现原来房东是她的老朋友正浩。 从那刻起，这有点疯狂的关系将从友谊发展成爱情。

权奕洲就像牛一样固执，自尊心极强，生活中视义气为头等大事。他一向鲁莽轻率且单纯无知，因偶然机会参加一个青少年舞蹈比赛，硬着头皮站到舞台上跳舞。从小到大他都被当作不良少年责骂训斥，但在舞台上，他第一次听到人们为自己大声欢呼。从那天起，他就决心要成为一名歌手。然而，想成为明星的人可不止他一个， 桑米也怀抱同样的梦想。桑米是个笨拙的女孩，任性且头脑简单。她活在自己的小世界里，幻想着未来的人生，最终竟踏上了实现明星梦想之路。与此同时，命运使得权奕洲与当今天才明星 Rex相遇了，人生亦面临巨大转折。会有什么样的未来，在等待着这些想成为明星的男孩女孩？