Lan Waihu's mother was not married yet when she gave birth to her. As her surname was 'Lan' and she was named as Waihu, Yan Chen's parents had a little bit of hope that Lan Waihu's father was a descendant of the Blue Fox family. Lan Waihu would have the pure family lineage of the Blue Fox family if that were the case. Therefore, they decided to adopt Lan Waihu. However, observing her for several years, they discovered that she did not have any relationship with the Blue Fox family and so they gave up on their wishful thinking.
After that, they sent Lan Waihu to the Tianju Association. The main reason was that Lan Waihu had talent, and they wanted to find a good subordinate for their son. They figured that Lan Waihu would protect Yan Chen and help him out as much as possible since they had treated her quite well. However, they never expected Yan Chen to fall in love with Lan Waihu.