The woman 2nd prince is talking about is Lin Feng's mother who is a peerless talent in Xue Yue but is "imprisoned" in a forest behind the King's palace. She is self imprisoned because the King loved her but she loved MC's dad and because the king couldn't have her he forced her to stay in that forest while he sealed his dad's cultivation. She is 2nd strongest person in Xue Yue so if people know MC is her son no one will mess with him. 2nd prince is scheming and just wants to use MC/ MC's mother to improve his chance at throne - much later we'll learn he's actually a big bad villain and more evil than we thought.