Is clear the emperor likes Yo, but since he couldn’t have her he had to settle with the sister. And even then, after seeing Rinhwa, he was disappointed by the fact that she didn’t resemble Yo as much as he had hoped.
Still he took her in, maybe in the hopes that Yo will continue to visit the palace, not matter what, since now her sister is living there.
It could also be that seeing Rinhwa’s face makes him think of Yo, and that’s enough for him.
HeuCal
Is clear the emperor likes Yo, but since he couldn’t have her he had to settle with the sister. And even then, after seeing Rinhwa, he was disappointed by the fact that she didn’t resemble Yo as much as he had hoped.
Still he took her in, maybe in the hopes that Yo will continue to visit the palace, not matter what, since now her sister is living there.
It could also be that seeing Rinhwa’s face makes him think of Yo, and that’s enough for him.