President Koji Hanada

Before Koji became the president of the company, he happened to have a conference call with Grandma Hanada and Jeff. That was where he discovered what really happened to the company and Tanaga, and his father's involvement. 

That had been the reason for Koji to reject the position, and he wanted to resign as COO of the THJ Group. He felt belittled and ashamed when he discovered that his father ordered him to kill Tanaga and Grandma Hanada. 

But Grandma Hanada disagreed with what Koji wanted to happen. As he was the only one she could depend on the most, she still was not sure what would happen to Tanaga. 

Grandma Hanada thought of a way to change Koji's mind to accept the position of President of the company. Grandma Hanada told the secret of their family – the secret that Koji's father was adopted. 

That way, Grandma Hanada could take everything Koji's family had and put his father behind bars forever.