Five years ago, after getting heavily drunk one night, Du Youtong mistakenly slept with Chen Yang, the troublemaking devil and twin younger brother of the man she had a crush on, Chen Ji. Filled with shame and anger, she fled far away to Haicheng, hoping to bury that absurd episode completely. Five years later, Du Youtong was struggling to make her way at a public relations company in Haicheng when, at a dinner with a top client, she ran straight into Chen Yang, the man she had been avoiding for years. To keep his runaway childhood sweetheart by his side forever, Chen Yang became a domineering client and forcefully barged into Du Youtong's life. As the truth of what happened back then was gradually unraveled, Du Youtong suddenly realized that the vicious dog she had hated for five years was actually an unhinged yet loyal dog who had shielded her from every storm and kept himself pure for her.