When they were teenagers, Ye Luan and Xiao Yijian both had a dream: "Are you willing to travel across time and space to save him/her?" Their answer was "yes." Even though I don't know that him/her.
They all have the same mission in a time and space that does not belong to them.
In the end, under the arrangement of this "fate", they finally got to know each other.
Intention: You and I are both admirers traveling through time and space