Kang Ji Hyun is a normal and simple girl in her school. She lives in a six-siblings family and she is the firstborn. Of course, she has enemies. But who knows, that she was being spied! After she knew that she was being spied, she gets really excited like a crazy person. But beyond her happiness, she don't know who is the spy. So, she started to find her secret admirer. Who do you think the spyer is? Was it her crush, Bang Yongguk who is a very handsome but a shy man or her childhood friend, Lee Sungyeol who is hiding his feelings towards JiHyun since they met?