Kim Chan-woo

Tae-young is a former fighter who now runs a relatively legitimate disco club business. He has a best friend named Joon-suk who runs a bakery with In-hye and is always ready to help Tae-young. When Tae-young refuses to let drug lord Ma Gun-soo use his disco club as a place of business, Gun-soo injects him with drugs and sets him up to the police. Tae-young serves time for a crime he did not commit. After his release, Tae-young attacks Gun-soo's son Tae-ho. Gun-soo retaliates by attacking Joon-suk and In-hye. He tortures and kills Joon-suk. Having lost everything to Gun-soo and his men, Tae-young plans one final battle. He alerts the police to come at a specified moment and prepares for a fight to the finish.

Hae Jung is the eldest of four sisters, and is kind and giving to her younger sisters - even though she's actually their half-sister. In contrast, second sister Yu Jin is ambitious and straightforward, and cares deeply for family friend Young Hoon, causing plenty of problems for everyone else! Third sister Yu Mi is materialistic and gets engaged to a rich gentleman despite having another, more suitable lover. And fourth sister Yu Sun is a high school student with a heart problem - and ardent love for her high school teacher! As the years pass, each sister struggles to find true love, and conflicts and difficulties arise. But through it all, they remain true to each other.

This drama is about the lives of sisters Da-young and Suh-young.