A bonus story for Yu Hen. I like Yu Hen so much that I wrote a harem story about him just for fun. It's probably Mary Sue. Have you read Xi Zi Qing's My Concubine, Jing Hua? The timeline picks up from where that story leaves off.
Here's the heroine's introduction:
An Ning is a cold-blooded assassin from the 21st century. She trusts the wrong person, her best friend dies tragically, and her family is also murdered after being set up. An Ning devotes herself to revenge, but accidentally dies alongside the scumbag man in her revenge plan. When she opens her eyes again, she has transmigrated to another world.
Theme: To be added.