A pure-hearted, adorable, kind seven-tailed fox immortal, Shen Chen, x a calculating, scheming younger ghost king, Jun. (They start out farming together, then fall out. In the middle, there are monster-fighting episodic arcs and a pursuit of the love interest. In the end, the pursuit succeeds, and they live happily together.)
(Please note the warnings: At first, there is a wall-and-paper marriage, but no tendency toward violence. The plot may get melodramatic and unpredictable, and it's a slow burn... The author is a shut-in and updates irregularly, with no set schedule, but will try to update two or three times a week. Thanks for understanding, everyone who enjoys it.)
Theme: After a century, two people find themselves in very different circumstances and social positions. See how the ghost king "repays his debt of gratitude."