He Forced Me to Feed Gu with Blood, but After I Succeeded, He Went Crazy.

The Heroine Died and the Hero Regretted a Short Sad Story

He didn't cherish the heroine when she was alive. Later, the heroine really died and the hero regretted it. Or the heroine faked her death. After the hero found her, he found that she and the second boy were living happily together.