Song Mo and Shen Sijing were childhood sweethearts. After the accidental death of Shen's mother, Song's mother and Shen's father were together, and their relationship broke down. Shen Sijing is hard-spoken and soft-hearted, but secretly has feelings for her without knowing it. Song Mo has a paranoid personality. In order to force Shen Sijing to face his feelings, she starts dog training and wants Shen Sijing to become her subordinate.
