Hye-young (Moon Hee), a kindergardten teacher, and Shin-ho (Shin Young-kyun) are in love. Hye-young takes care of Shin-ho who lives alone as a boarder, dreaming of a happy future together. But one day, Shin-ho's wife (Jeon Gye-hyeon) arrives unexpectedly with his two children. Hye-young, shocked about Shin-ho being a married man, leaves him and disappears. After 8 years, Shin-ho has become a successful businessman living happily with his family. This is when Hye-young re-appears with his son Young-shin (Kim Jung-hoon). When Hye-young left him eight years ago, she was already pregnant with his baby. She's been raising the baby alone. Young-shin is now ready to enter elementary school and he has always longed for his father. Hye-young decides to send her son to his father for a better future. Finally, Young-shin gets to live with his father and his father's family but he doesn't get along well with his step brother and sister. Also, he longs for his mother and finally decides to go back to where he lived with his mom. Shin-ho and his family look for Young-shin all night long when Hye-young is hiding around Shin-ho's house longing to see her son from a distance. Deep in the night, Young-shin returns home having no success finding a way to get to his mom and is spanked by his angry father. Hye-young catches the sight and decides to take her son back with her. On the next day, Hye-young takes her son back to her house while the rest of the family watches the mother and son leave t