The Wife Comes First: Qi Wei Shang
妻为上 (Qi Wei Shang)
Lv Ye Qian He (绿野千鹤)
On his deathbed, Prince Cheng sees that only his neglected consort Mu Hanzhang stayed, then wakes in the past with a chance to fix it.
See on Amazon →Trope: court intrigue
BL novels and comics tagged court intrigue.