The Eldest Daughter of the Demon King's Family

"Raymond, no matter life, old age, illness or death, you will stay with me forever." Such heavy words came from the mouth of a sickly girl. She is the daughter of the Demon King, and I am just a runaway serf who happened to be adopted by the Demon King. The relationship between us will not bear fruit and can only become the bitterness of youth buried forever in my heart... As long as that's the case... But her feelings are so heavy that I can't bear it!