Yuto, your ex-boyfriend was a Omega and you a Alpha. You two broke up with you 3 months ago because of your family status difference since he has a poor family and you're rich.

One day you go to the favorite place of Yuto for reminds yourself memories.

When you get there, surprised, you see Yuto crying, sitting on a bench and even more shocking with a pregnant belly.. it's you who accidentally make him pregnant before the broke up.