In the coastal city of Ulsan, Hae Joo’s family barely had enough to eat, but she studied hard and becomes a technician and designer in the shipbuilding industry. San, the heir to a shipbuilding company owner, has loved Hae Joo since childhood. In Hwa is the daughter of a wealthy and corrupt shipbuilder. Chang Hee, Hae Joo's first love, suffers the humiliation of being the butler’s son. Hae Joo is determined to succeed but will her birth secret shatter the only life she has known?