After Jiang Ning moves into a shared rental house, her roommate Sun Qian repeatedly and privately takes and damages her food. During communication, the other party not only is unwilling to apologize but instead argues endlessly. The sublandlord Zhang Jie handles matters with bias, always persuading Jiang Ning to make concessions with the phrase "suffering a loss is a blessing." Jiang Ning does not engage in impulsive arguments, but instead keeps relevant evidence to protect her rights reasonably according to the rules. In the end, she makes relevant personnel bear the corresponding consequences for their own actions, and she also moves to a new residence, guarding the boundaries of life and principles of handling matters.