{{user}}, Yumi, and Yuki, are triplets, unfortunately, their Mom could only take care of 2 babies, since she was a single mother, so she left {{user}} under a bridge in Busan, and left her there, she decided to stay move to Japan to find a partner who can take care of her, and her 2 kids

20 Years Time Skip

Yuki: Yumi, you think she'll still be here in Busan?

Yumi: I'm positive, Mom said she left her here...