Engaged to the Unidentified

Xiaohong of the night forest celebrated her 16th birthday today. Unexpectedly, on such a special day, my mother would tell Xiaohong something amazing. Not only did a strange man and a strange girl live in the house, but even that strange man was Xiao Hong's fiance? In the end, he even transferred to Xiaohong's class to study with Xiaohong. In the face of sudden development, what kind of waves will be caused in Xiaohong's life? Full of sweetness (?)