A reversal of bullying?!

In this work, a transfer student suddenly arrives to Jungkook, who is being bullied. From then on, Jungkook avoids the bullying and becomes a bully. He starts dating the transfer student (Sojung) and even gets married. However, a fox girl suddenly appears and interferes with their relationship. In the end, Jungkook kills the fox due to his severe anger management. He then enters a mental hospital and receives treatment, and lives happily with Sojung.