An evil twin brother determined to destroy the world, a band of heroes trying to save the world, lovers separated at the end; it's a very dramatic turn of events. In a different situation it'd feel almost unbelievable, but reality can be grander than fiction. The only thing saving this from a tragic ending is Zhao clearly came back into his (and Da Qing's) life.

"How long did it take for the two of you to reunite?" It still doesn't change the fact they were separated. For however long they were together, perhaps any amount of time is too much.