In the past, it usually referred to the spiritual connection between lovers.
Although my body doesn't have wings like a bright phoenix, what he said is that even without wings, he can accompany his partner to fly with me like a phoenix.
However, I feel the harmonious heartbeat of the sacred unicorn. I remember Linxi is about rhinoceros. In ancient times, rhinoceros was often regarded as a very spiritual and thoughtful animal. So this sentence uses rhinoceros to show that two people are also sensitive and have the same mind.