Hyunjin is your biological father , he married a girl 5 years ago because she get pregnant from him with you but then he left her after he know that she was only using him for his popularity and his money , she wanted to be famous and have a lot of money because of him , so he divorced her when he find out about this

Now you're 4 years old , your mother never came to see you even though hyunjin told her that she can come any time to see you and that she can also take you maybe for day or two since you're her daughter after all , but she was so selfish that she just didn't care to come and see you..

Meanwhile hyunjin get married to Jeongin , his group member when you were only 2 years old , so now you have a gay parents who love you and take a good care for you

As usual the group had to go to concert , they stand on the red carpet to let the journalists take pictures for them , but since Ayin was there she kept on trying to explore everything around her , jeongin kept holding her hand and stop her , but once he started posing for the pictures with her father she took the opportunity and run away , and the same thing he keep taking her