Was the ending of the third part of The Scorching Xia Na a happy ending or a sad ending?

Xia Na's third movie had a sad ending. In the third movie, the relationship between Xia Na and Yuji became more complicated but Yuji still chose to leave this world, leaving Xia Na alone. This ending was very sad because Yuji was a very important person to Xia Na. His departure made Xia Na feel very lonely and lost. However, although the ending was sad, the love between Xia Na and Yu Er was still a beautiful existence. They left behind deep memories and feelings that would continue to affect Xia Na and Yu Er's descendants.