There are two kinds of people in the world, one is those who are constantly looking for love, and the other is the right person who is right beside them, no need to search, just never leave.
When Cheng Mengyu saw the familiar figure from behind, she knew that Gu Kai, who had given her the longest love confession after 18 years of companionship, was back. They had spent the most beautiful time together, and happiness was always unpredictable. After Gu Kai learned the truth, he left decisively, and their happiness collapsed. A few years later, Cheng Mengyu met Gu Kai again who had returned from a foreign country. How should she face Gu Kai, who had been hurt the most by her? And would Gu Kai still fulfill his promise that companionship is the longest confession of love? Are they still the right people for each other, or people who don't need to look for each other and will never leave each other?