Someone tell me what this is about please
Here's a summary I found that explains it pretty well.
Summary;
Lee EunHa was raised in the criminal organization of Serim from a young age. She's been waiting patiently for the opportunity to kill the leader of the rival organization, the man responsible for her parents' deaths. The opportunity comes in the form of her latest mission. She is ordered to kill Shin KyungHyun, the right-hand man of her parents' murderer. However, there is more to KyungHyun than meets the eye. As she begins to unravel the mystery behind the man by using her captivating charms, EunHa finds herself being the one seduced instead.
The translation in this manwha right now isnt the best.You can read the novel if you want it to be more clear.
He's a little crazy! Check that man into therapy immediately!