The similarity between Love on Turquoise Land and Love Song in Winter is that they both have the romance and mystery genres.
THE DIFFERENT: In "Love Song in Winter" there are repeated misunderstandings whereas in "Love on Turquoise Land" there is strong trust between the couple. The mystery elements in "Love Song in Winter" were almost solved separately by the couple whereas in "Love on Turquoise Land" the main couple struggled together to solve the mystery

The male main character is Gao Wei Guang
The main characters are both immortal beings
Both have the theme of eternal love