Tired of her difficult life, Cha Eun Sang takes the opportunity of her sister's wedding in the States to go start a new life for herself.

Eun Sang stays with Tan and experiences a day in his life. Unfortunately it puts her right in Rachel's line of fire, who's not happy to see another woman in Tan's home.

Tan and Eun Sang get stranded on the road. As they get to know each other better, Tan finds himself growing more attached to her.

Eun Sang returns to Korea, and discovers that her mother has moved in to the Kim household. Tan struggles with his position in the Kim family.

Tan causes an uproar in his house and with his social circle when he returns to Korea for good. Knowing that Eun Sang lives in his house, he enjoys a little bit of friendly and flirtatious teasing.

Eun Sang has a rough first week at Jeguk High, and it's not helped by the fact that she knows Tan before transferring to the school.

Tan flirts with Eun Sang excessively, while Young Do continues to torture her in school.

Young Do realizes that he can't get Eun Sang out of his mind. Tan confesses his feelings to Eun Sang, even though the world is pitted against their union.

Things get complicated when the whole school starts digging up on Eun Sang's background, and Tan isn't able to protect her.

It's camp time, but Tan decides not to join the rest of his class after having a falling out with Eun Sang.

The love triangle heats up between Tan, Eun Sang and Young Do. The news that Rachel and Young Do will become half-siblings goes public.

The two sons of Jeguk Group come face to face with reality when they realize that they're coming up against a formidable foe to protect their loves.

Eun Sang and Tan face up to all their opponents and announce their relationship, but it leads to a whole mess of problems for everyone around them.

Tan's father takes matters into his own hands when Rachel and Tan's engagement is called off. For the sake of peace, he starts a war within his family.

Won fights for his rightful position in Jeguk Group while Tan uses his shares to his advantage to protect Eun Sang.

Tan goes to extreme lengths to find Eun Sang, only to realize that the only way to protect her is to leave her.

Won steps in to help his brother and Eun Sang regain their footing. Young Do makes a painful choice for himself and his friends.

Kim Tan makes a public stand against his father for Eun Sang's sake, but his real obstacle is getting Eun Sang's mother's approval.

The fate of Jeguk Group lies in Kim Tan's hands.