Huiyeong is a young woman in her 20s who normally would be holding flowers in her hand from her boyfriend but in reality she holds her 7-year-old boys hand. During her immature years she happened to become a mother. A child giving birth to a child and without his father at that. But she's doing the best she can running a pizza shop with her mom and being the best mother she can be. She attends an alumni reunion and happens to meet the father of her child that doesn't even know he has a son!

What is the chance of meeting a girl in wedding dress wearing sneakers in a subway? Huisun is a webtoonist who is out of ideas. That's when she meets this girl who seems to have a story! The unlucky girl Bogyeong thinks that her husband-to-be ran away because of her and everything that happens to people around her is her fault. But she is so curious this time. She wants to know why her husband-to-be ran away. She doesn't want to blame herself or him without knowing the reason. So she goes to look for him but she misses the last train, she doesn't have any money for taxi. Then a somewhat kind-looking guy asks her where she's going. How long will he keep following her?

Chansu is a single father detective who is raising a daughter. However, his daughter is found dead one day and Junsik, the boy he trusts most in this world is the main suspect. What will Chansu do in this situation?