Omma has been waiting for the right man... again a while after Appa's death.  Then she found this youngster who happens to go to the same school as I do.  So it made me wonder how someone almost as young as I am fall for someone as old as Omma.  Something smells fishy here and I have to find out what it is.  He may be good, charming and all, but I would never and I mean never fall for those things.

Lee Joo-hyun (later Lee Seohyun)

The only daughter and heiress of the Lee family.  She had a perfect life with her friends and a perfect love life. As for her family life, it became a disaster ever since the death of her dad; her mom getting drunk, forcing her brother to temporarily stop his college studies to maintain the stability of their business.  When she found out that her mom has been dating Kyuhyun, she gets suspicious, so she tries to get to know more about his personal life and unexpectedly falls for him.   

Cho Kyuhyun

Seohyun's schoolmate whom her mom dates.  Though he knows that Seohyun is not in favor of him for being her stepfather-to-be, he still does his best just to prove to her that he can be both a father and a brother to her.  But one thing he doesn't know is that he's starting to love Seohyun, not as a daughter, nor as a sister.

Jung Yonghwa

The leader of a band in Joo-hyun's school.  He has everything; the looks, the talent, and lastly, the girl of his dreams.  However, things changed between him and Seohyun when Kyuhyun came into their lives.