What does the family of destiny express?

Love can know each other and promise each other, but it is resigned to fate. "Destiny" is a song in the TV series "Warrior Lan Ling". This song expresses that love can be mutually assured, but it is resigned to fate. Excerpt from lyrics: If you can blindfold, you can't be sad. Can you take off your mask? You can be cruel. If I hadn't met you, I wouldn't have believed it.