Vile Evil Hides Under The Veil - Chapter 1821 Virtue of Kindness Mark & the Refinement of Sin of Envy Mark

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

Witnessing her boyfriend cheating on her with her bestie, Shiyao was so angry that she went to a pub for fun and met a man, who was really a piece of work. After a crazy night she fled away, but was embarrassed to know that the man she slept with was her boss You Ze.
Jesus, give her a break!

- Description from Novelupdates

Many strange phenomena have been happening in Yin City. Li Ang—whose alias is Li Risheng—becomes embroiled in an absolute real game of life-and-death, known as Killing Field.Using his above average analytical and deductive skills, he completes different quests assigned by the system, such as eliminating supernatural beings or solving cases, while trying to unravel the true nature of the game.

She, a renowned assassin of the 21st century, actually crossed over to become Su Manor’s most useless good-for-nothing Fourth Miss.