As in the review is literally just like the title

anyone experience first love, during their younger years, don't lie,
some part of your conscience still cannot forget your first love.

Lets talk about the Story
12 episode is short but it conveys the directors and actors perception of the story, eerie questions fly into one's mind
Pre Mission
will this mission help me get close to my wife family?
will this mission benefit me?
will this mission help bring justice?
will this mission increase my net worth to provide for my wife?
During Mission
what's happening?
Am i going too far?
Protecting my wife is my priority?
what happened to me?
is this still part of the mission?
Post Mission
Will we be able to go back we were before?
Why are you on his side crying?
Is this the result of going to deep in the mission?
Do I still want to protect you?
questions asked by the ML is happening in today's environment, even in South Korea, a very realistic approach on the story. The 5 deadly sins is also heavily conveyed into one worst of somebody (you got envy, you got greed, you got wrath, you got gluttony, you got pride).

Lets talk about the Cast
a good cast, each character held its own, never new that the SFL is her first drama in south korea, and she got the lines and looks, now the about the title, FL and SML, they portrait that the first love is to die for really well, ML conveys the character pretty well, and its happening on all police officers. Chief and the Violent Crimes Detective, an example of do anything at all cost, supporting role cast filled in the shoes really well,.

Lets talk about OST
OST is not the strongest part of this series, the ending OST is intense, the good thing is they did not insert any cheesy ost here
all business,.

Rewatch Value
Yes, this is one of the top 20 pyschological thriller genre of all time, globally
for south korea, its top 3, number 1 and 2 for me is still "I saw the Devil" and "Through the Darkness"


now, does your wives, best friend, lover, have a first love from their past that you don't know about?
its gonna eat you and a good start of argument.