I'm going to suggest mine: https://www.webnovel.com/book/14395215405206105/Peerless-Lovers
synopsis:
Ling Daiyu is the worlds most deadliest assassin. More like deadliest human weapon! She is not your ordinary assassin. Something about her seems different. Perfect at everything, High intelligence, beautiful, emotionless and cold. This is what she lives for! Then what makes her so different from other assassins?
Feng Huan is a filthy rich business man. A billionaire. Handsome, intelligent, perfectionist, workaholic and cold. There is not one person that dares to offend him. No one can melt his icy heart. Or is there? His life turns upside down when he meets Ling Daiyu.
These people are perfect for each other!
When Ling Daiyu is right in front of death’s doorstep, Feng Huan saves her life. With nowhere to go, she decides to follow Feng Huan and becomes his bodyguard while trying to live a somewhat normal lifestyle. Finally feeling emotions and enjoying her freedom, people from the organization she belonged to start showing up. Will she be able to carry on this new life? Or will she have to go back to that traumatic place...
It's a romance but I don't want to focus too much on it so it's kinda like romance and action, half and half really.