Coming from a poor background, Hyun-woo works for Soonyang Group and serves the owner family. Chairman Jin Young-ki of Soonyang Group suddenly faints, and everyone in the family quickly looks for a chance to take the position. Meanwhile, Hyun-woo finds the paper company that’s been creating slush funds for Soonyang and is sent on a mission to retrieve them.

Hyun-woo realizes that he was reborn as the youngest grandson of the Soonyang family, Jin Do-jun. As he comes from the future, he gives useful advice to Chairman Jin Yang-chul, the founder of Soonyang who is now his grandfather. He quickly wins the chairman’s confidence, becoming Chairman Jin’s most adored grandson.

Do-jun appears in front of Chairman Jin as the majority shareholder of Miracle Investment. Chairman Jin tells Do-jun that he'll never be able to buy Soonyang with his money. Then he hurries with the succession of the company to his eldest grandson, Seong-joon.

On the day of Seong-joon’s wedding, Chairman Jin announces that he will no longer follow the rule of primogeniture and pass the company down to whoever proves their competence. The siblings of the Jin family eye on each other’s shares, while Do-jun eggs on the siblings to mistrust each other.

After Chairman Jin and Do-jun survive the car accident, Chairman Jin secretly looks for the culprit who tried to kill him. The three children of Chairman Jin, who do not know that their father is fine, begin a war of succession on their own.

Do-jun insists on using an aggressive marketing strategy on Soonyang Motors using the 2002 World Cup results he knows from his previous life. Upon hearing the success of Apollo, Soonyang Motors' new car, Chairman Jin Yang-chul decides to fix his will, which puts everyone in the family in an ordeal.

Do-jun fails to become the CEO of Soonyang Financial Holding Company because of Seong-joon's scheme. Just when he was despondent over the loss, Mr. Lee Hang-jae handed over the will Chairman Jin Yang-chul left for him separately.

Just when Vice-Chairman Jin Young-ki thinks he has won the fight to own Soonyang, Do-jun shares the news that he bought out all of Soonyang Corporation’s shares. The fight to win the management rights of Soonyang continues, and the fight between the Jin brothers becomes dirtier.

After the car accident, Do-jun returns to his old self, Hyun-woo. Hyun-woo needs to clear himself of the charge of embezzling 700 billion won. The Jin family is still in a family feud to win the management rights of Soonyang, and Hyun-woo decides to end the war once and for all.