Zhang Ming and Qin Mengmeng are playmates from childhood to adulthood. Whether it is primary school, middle school or high school, they all study together. At the same time, because they live in a small community, they often have contacts with each other, and occasionally visit the door, which is family meals. For Zhang Ming, it would be a great happiness to be able to stay in Qin Mengmeng’s home every day and not want to leave. Of course, this is not just because of his beautiful and lovely childhood sweetheart, Qin Mengmeng, but because of Qin Mengmeng’s sister Qin Qing.