beta
So the novel clear it up: MLs message with the sik scarf to her back then was was either shut up or die. In the novel it was implied that she forced him to make her the the empress and legitimate companion but he didn’t care back then, so he just sent her the scarf as a warning, thinking that MC would choose not kill herself but she did.
So after she died, he suffers from the after effects of vomiting black blood 12x a day for around 2 to 3 years before going mad and killing everyone then turned back time.