In their third year (last year) of high school, Sumin gets a teacher who assigns seats. Unluckily for Sumin, she is seated next to a gangster, Park Jimin. She has heard bad things about him, but Jimin didn't even know that Sumin existed. Having her ex boyfriend coming back and Jimin irritating the heck out of her, how is she going to survive her last year of high school? But most importantly, who knew that Jimin can such a sweetheart? Who knew that Sumin can unravel Jimin's sweet side?