Not caring sometimes becomes a cowardly excuse to act openly. Tao Yanran has been walking around the world relying on the three words "don't care" for twenty years, and gradually realized the disaster caused by these three words. Finding that she was becoming less and less able to interact with others, she decided to move out of her dormitory, where she met her neighbor Xu Yunze.
Yanran, who lives alone, also began to reflect on her words and deeds. When she sorted out her thoughts, she discovered that many things were caused by her being a "lonely person"... How will she regain her confidence?