During the summer vacation of the first year of high school, Si Lei's girlfriend Mo Jing, who had been with him for a year, died unexpectedly, and Si Lei was in pain. Mo Jing's sister Mo Ning fell in love with Si Lei at first sight and has been with Si Lei since her sister's death. However, Si Lei didn't find a girlfriend for three years, and Mo Ning thought he would never fall in love with anyone again... Until a girl named Su Xiawei appeared, and this person opened Si Lei's new house again...