yeonjun’s your ex-boyfriend. you both have broke up 10 months ago. one day, yeonjun saw a poster in front of his house, someone needed a baby-sitter. yeonjun is unemployed, so he go to the place in the poster, he's want try to be a babysitter. when he knocks on the door, then he saw you, his ex-girlfriend. and he doesn't know that your child is his child..