The secretary of a cranky, genius math instructor goes to his house to get revenge.  So later when her boss suffers a serious accident and loses his memory, she becomes the top suspect.  In desperation, she lies and says they are secretly engaged.  But as she stays at his side, nursing him back to health, she finds he is not the monster she once believed he was.  And as she begins helping him try to find out who the real culprit is, she finds herself wishing their relationship wasn't fake after all.  

Krystal Jung as Lee Shin A

Lee Shin A has always dreamed of being a teacher.  But when she fails her teaching demonstration, they move her into the position as Go Jin's secretary.  Although he is demanding and rude, Shin A suffers through it all to achieve her dream.  But as she celebrates her year anniversary in that position, she finds out that she is dying of cancer.  Blaming her harsh work environment, she vows revenge on Go Jin.  That night, when she goes to his house to confront him, he runs after her and is hit by a car.  According to police, she is the number one suspect.  So when she hears Go Jin has no memory, she pretends they are engaged.  But as she takes care of him and works closely with him, she begins to see that he is not the person she had always thought.  And as she falls in love with him, she is determined to find out who tried to hurt him.  

Lee Shin A is hard working and generous.  She is known by friends and family as someone who doesn't know how to say no.  But she has been pushed around by Go Jin and her other co-workers to the point that she is truly sick of it.  And her cancer diagnosis is the last straw!  Krystal Jung has made the transition from idol to actress pretty well, and I thought she did a nice job in this role.  She played the part with an honest and straightforward  attitude that fit the character well.  

Yoo In Younas Baek Soo Young

Baek Soo Young is Go Jin's first love and the one who broke his heart when he was young.  Now she is back and in charge of one of GOTOP's biggest competitors.  But she is more interested in winning back Go Jin's heart than stealing his company.  Unfortunately for her, even without his memory, Go Jin seems completely uninterested in her, no matter how hard she pushes.  

 ♥ Shin A's Father

The relationship between Shin A and her family was a fun element of this drama.  I especially liked it when Go Jin started interacting with them.  Soo Ho's quick acceptance of him as an older brother was sweet and fun to watch.  But it was Shin A's father who really stole the show in this department.  His good natured urging that Shin A should be having her fiance stay over was fun and unexpected.  And the way he immediately felt a genuine affection for Go Jin was very heartwarming, especially when we have seen how much Go Jin has missed having a family of his own.  

 ♥ Web of "Villains"

I have complained before about the ladder of villains, that just when it seems like the mystery is solved, we find out there is another more evil villain still to come.  But in this drama, there is a complex web of villains who each have a part to play in what happened to Go Jin.  It was interesting the way they weaved each of the strings in to complete the full picture.  While the ex-secretary breaking the security camera isn't a big deal in itself, it played a pivotal part in allowing the true villains to stay hidden.  Each character has some impact, no matter how small, in the big picture of  Go Jin's accident and injury.  

Soo Young

I usually don't like the "ex is back" trope, and this one really irritated me.  Soo Young's character seemed unrealistic and egotistical.  The idea that she could just blame her actions on her dad and waltz back in as if nothing happened doesn't seem logical to me.  Also, in one breath, she says that maybe if Go Jin can't remember the past, he will fall in love with her again.  And in the next breath, she is angry that she is the only one who remembers their time together. You can't have it both ways!  

Park Yang Tae

I'm not sure I understand the point of Park Yang Tae's character.  If Soo Young's company was going to be the one to come in and challenge GOTOP, then why did we even need Yang Tae.  He gives some insight into Go Jin's past, but Soo Young could have easily done that on her own.  There are a couple funny scenes between Yang Tae and Go Jin early on and we do see Ms. Ma working with him, but in the end the character and his company have little bearing on the overall plot.  With so many sub-plots going on, his screen time could have been better used with some of the other, more pivotal characters.  

"Crazy Love" ends on a happy note for pretty much everyone.  We find out the Jong Ho is the real villain mastermind.  He was dating Se Gi's sister, and her suicide had more to do with guilt over stealing Go Jin's teaching material than Go Jin's cruel words.  Refusing to accept his own part in her death, Jong Ho chose to blame Go Jin.  And he tampered with a voice recording to convince Se Gi that it was Go Jin who was responsible.  With all of this out in the open, Go Jin realizes how much he has inflicted pain on those around him.  And with Shin A's encouragement, he begins to apologize to everyone he has hurt along the way.  And with his apologies, all the bad feelings magically melt away.  Go Jin hires back most everyone who was fired or had quit.  Shin A decides to take her future into her own hands by becoming the masked instructor online. And this leads to her being hired by Soo Young.  On her first day of lecture, Go Jin meets Shin A after work and finally proposes for real.  The final montage shows the happy couple, married and living a crazy life together.