Even if Yeon chose Doha at present, her ultimate companion is Biseol because he's the one to accompany her to ascend when her reign comes to an end. That's probably why Doha wants to participate on the next trial and become emperor himself so he could ascend as well and chase after yeon to the heavens. And hamil, on the other hand, will cycle back to life after death, unable to fulfill his greatest wish to be with Yeon every lifetime. It was bittersweet but the ending felt quite empty even though it had a happy joke to it.
Even if Yeon chose Doha at present, her ultimate companion is Biseol because he's the one to accompany her to ascend when her reign comes to an end. That's probably why Doha wants to participate on the next trial and become emperor himself so he could ascend as well and chase after yeon to the heavens. And hamil, on the other hand, will cycle back to life after death, unable to fulfill his greatest wish to be with Yeon every lifetime. It was bittersweet but the ending felt quite empty even though it had a happy joke to it.