The Princess is a Bit Angelic Bitchy 26

Just three or five days later, Emperor Jiayuan's headaches worsened, leading the court ministers to believe that he might not live long. Consequently, they began seeking new allegiances, all heading to see Shen Shian. However, Shen Shian, already instructed by Shen Qi, refused to meet any of the ministers and instead frequently stayed by Emperor Jiayuan's side. Even when Emperor Jiayuan's temper flared and he scolded Shen Shian, the latter ignored it and maintained his role as a filial son and grandson. Gradually, Emperor Jiayuan began to trust him.

Perhaps sensing his own mortality, Emperor Jiayuan started teaching Shen Shian the darker arts of imperial power and the principles of rulership. Over half a month passed this way.