I Only Hate That Longing Has No End

I quite like it, because the male protagonist is not as brainless as the other male protagonists. He ran to investigate, but the investigation was too late. The heroine died just after he was found out, and was killed by Qi Xin. Later, the heroine's father repented and Qi Xin also committed suicide. In the end, they reunited. The female protagonist of this book is okay, and the male protagonist is not brainless, so I quite like it.