Like other teenager, Park Seo Young, who had just entered her first week of high school, thought that she would be able to make lots of friends and a boyfriend. But in reality she is quite timid, unlike her classmate Park Jun Seo who at the same time has many friends. Park Seo Young admires Park Jun Seo who is sociable and also handsome. While in class, again like the previous days Park Seo Young got a message that someone gave her chocolate as a gift but it was sent anonymously. Park Seo Young, who really likes chocolate, is confused because she is afraid that the sender of the gift will ask her to pay one day. Besides that, Park Seo Young was also afraid that it was a phishing because the message was sent using an application that she had never heard of before. Who is the sender of the chocolate? Will Park Seo Young be able to make friends and boyfriend during her school days?