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If I’m understanding it right kwon was cursed in his past life which transferred over to his current life, and he “reunited” with his husband from the past “shin yooyoung” but the real shin yooyoung from his current life has passed away and there’s someone else in his body. And kwon is finally putting the pieces together. (MAYBE SPOILER)
And this is just an IDEA and not something that has been said in the story yet, but I’m pretty sure that the reason why yooyoung has white hair now is because he was possessed by the spirit of the “young master” (guy with the white hair from the past)that was shown in the last episode. And I believe that “shin yooyoung” is pretending to be who he is because he was in love with kwon in his past life and couldn’t have him because the real shin yooyoung.
I don't understand the plot? (⊙…⊙ )