How to watch the finale of Hong Kong drama One Man in Time and Space?

The third brother may be the only one who returns to the finale, as long as the third brother follows the progress in the history books. It doesn't matter how Yuan Chonghuan Zuo Guangdou died, as long as Xiao Lizi can find someone to replace him when he comes back. The reason is that if no one goes back, the eldest miss won't recall the past with the army, because for this time and space, nothing happened before, that is to say, after the army left, the third brother and Zuo Guangdou or only the third brother went back to put things right according to the history books, so the eldest miss suddenly recalled the past on the way.