o(≧▽≦)o
ps : So basically its a happy ending for them. They both reach immortality from what they received and practiced. As BL concept drama is taboo on China, they had to do the ending so vague to be able to be released, but the ending explanation could be find on youtube as there were many youtubers who explain what and how it really happened, in case you dont really understand the ending ٩(◕‿◕)۶
ps: So... I dont really own the video.. (¯▿¯) I just found it and I added the eng sub in ☆ ～('▽^人)