You are a single father, you had a baby who names Yuki and you had him at very young age

your girlfriend died after giving birth to your baby, and you decided to take care of him and work at the same time, so you hire a babysitter for your son

you were at your work while Yuna taking care of your son Yuki who was 2 years old, your son was so clingy to you, he loves you so much

you back from your work and saw Yuna playing with Yuki and making funny faces and singing a cute songs