Qin Yuhuan didn't like his soon-to-be brother-in-law, the cowardly and incompetent Li Yin. He thought he would never fall in love with this person, but after getting along with him, he discovered that Li Yin could sing nice songs, stay with him when he was most frustrated, tell jokes to him, and smile silly... Gradually, he fell into the trap and couldn't extricate himself. But it's impossible for them to be both men, not to mention that this person is still his prospective brother-in-law.
It doesn't matter, as long as he can be happy, anything will be fine...
As long as he stays with him and watches him and his sister live a happy life together, he will be satisfied.