This will be short.
Always in mangas/manhwas with romance, we have reason for love. Or we should have. Not in this one.
Story is very amusing. Art is great (it's on 100% Perfect Girl level!). But... something is missing.
Female lead is quite good. She has everything needed to be great heroine. Tragic past? Check. Beauty? Check. Guts? Check. Bishies falls for her? Check. So, why i'm complaining? She falls in love with male lead (obvious from the begining so no spoiler). But why she falls for him? dunno. Other lead is doing everything for her. Killing, protecting, visiting, getting jelous and possesive.
And ML ? He is always absent or "looks lonely". It's all. She falls for him, just because he is male lead. Almost all the time we have other lead doing something. So in my opinion - it's looks kind of disappointing. If almost all the action is about other male lead (IMAO something about 80% of all), and girl choose other one for no reason- it gets on my nerves. Almost all the time i felt sorry for the second ML, cause he couldn't have the girl just because he was not destined to be main character.
If we consider all 3 bishies as potencial lovers - the one, who wins girl is less suitable. It's not realistic at all. C'mon, if you fall in love, you fall in love with someone because something happends, not because this one suits the plot.
Do i recommend this? SURE! If you would like to read highly amusing story with sexy bishies - it's title for You! Your heart will flutter, for sure. But relactionship development for main pairing is quite poor, and you need to know it from the begining. So, enjoy the story, but do not wait for male lead to start doing something. He won't. He will just sit and "looks lonely".