Coming from an elite household, Mu Sheng had several wives. There were no impressive weddings organized for them. A second wife, no matter how low her status may be, would be unable to enter the lineage!
If she was a little more competent and gave birth to a talented son or daughter, she would be added to the lineage, but as a second wife, her status would never be acknowledged in public even in a million years.
Mu Lianjue's mother was one of those wives.
In other words, if Yun Shishi became a second wife to Mu Yazhe, she would not have any status in the household!
In Mu Linfeng's heart, giving her a position as a second wife was already a favor to her!
For a commoner with no notable background to succeed in marrying into their family was already a huge blessing!
Moreover, his second uncle knew who his wife's biological mother was.