I didn't like the first episode. At all. But started and continued this drama for Marcus Chang and later the OST.

I finished Secret (Kdrama) right before this, and Yi Ting gave me serious vibes if the ML, Min Hyeok. But, the execution of this drama is very different in the sense that as the audience, we don't actually know the back story of events and why the ML is doing what he's doing.

Plot:
Typical revenge plot. ML sort of plays the girl, but then actually falls for her. FL is, as expected for these types of plots, sweet, naive and really friendly.

OST:
This is probably my favourite OST. The music suites this drama so well, suspenseful and fast pace with AMAZING lyrics. The lyrics (translation) of the songs suited the scenes so well and were also like a reply to one another. Here are 2/3 OST's.

1st OST (Opening) Chorus:
I will love you [English]
Love is like mockery
Don't accept his nonsense

I will be waiting [English]
How ridiculous is love?
He was the one who turned it into a joke (his love is a joke).
It's not the incapability of loving, it's that he's unworthy (he is unworthy of your love).

2nd OST Chorus:
Walked past so many intersections I was once confused and suspected the map in my hands.
Heading towards your direction , caught in a maze of pursuit , exhausted , exile.
Even if this journey in search of you is toilsome painful and makes me lose my way.
You are that happy destination that will end my lonelyness.

Yi Ting:
Yi Ting started off as a serious bastard in this drama (especially where the SFL, his business partners daughter was concerned), but it also made him hotter, especially his ('evil') smirk. I love Marcus Chang, but I wanted to punch his character in the face at the start, but then you realise that he was NEVER bad. Yi Ting is a character you love to hate (because you don't yet know why he's doing what he's doing, or what he's actually doing), but a character you grow to love. He's really bipolar if anything, gives so many mixed signals and it takes half this drama to figure out where he stands and whether he's sincere. Like the OST lyrics, I wasn't sure whether his love was real or not. Best way to describe him is that he comes off as very SKETCHY and lonely. We don't see his whole story at first, which makes his actions more intriguing, and Marcus Chang just looks really, really HOT in this role as an anti-hero lead, and not just a jerky/narcissist person as his character was at the start of Lost Romance.

Lei Xinyu:
I liked her a lot because I understood her. She didn't annoy me and didn't come off as a damsel in distress. Though she's naive, it's not unreasonably so, and it makes sense for her to be the way she is. Her character made sense and in a way, she was really strong. She lost everything in a day, but bared through through it and came out better. Personality wise I really liked her, but she was a bit too nice, surprisingly not that forgiving though. She was also unexpectedly smart, she has great education, but she was also smart in the way the ML was smart, I didn't think she could pull off hiding secrets, but she could.

Lin Man:
No spoilers or anything. I didn't ever think she was as bad as everyone said she was, simply for the fact that Lei Xinyu was her daughter. And her daughter thought the world of her, the daughter she raised herself and who grew up with her influence. But, I also knew that Yi Ting couldn't be entirely wrong about her because he spent 12 years obsessing over her.

Xiao Yue:
I loved Xiao Yue. She was my favourite characters. A strong/badass female, who's also nice and genuine. Unlike the FL she puts people in their place from the start. She is the kind of friend that I can only wish to have. Zhong Wen was the perfect man for Xiao Yue, I knew from the moment she started taking his emails that they'd have some sort of romantic pairing.

Zhong Wen:
Similar to the FL personality wise. A really good, friendly but naive person when it comes to social interactions. Xiao Yue has street smarts and understands how people really are, whilst Zhong Wen, like Xinyu, was protected from the real world and at first didn't really understand it. But he was also well educated, from a wealthy family and book smart.

Got bored towards the end and started skipping through it. But overall, it was worth the watch.