Her due date just so happens to be due on Valentine's Day. And to her luck the baby daddy doesn't even know she's pregnant. 

One night stand and nine months later she was going to give birth. 

And on that day she just so happens to meet the father of her child.  

What will she do? Tell him she's pregnant? Or keep it to herself? 

Being independent Choi Sulli has been doing that all her life. To when her parents separated and she stayed with relatives growing up. She's been lonely. 

Only her few close friends knew of her problem. Even the guy that likes her. 

Poor Sulli knocked it out with a man who she didn't even know his name.