A little lightful gem. Definitely unconventional, thus this is the main reason why I liked the idea behind this show and the show itself. A show which probably will be disliked by the majority who looks for the typical love story that a k-drama usually offers. And that I liked because of this being so atypical. But that was not the only reason.
Talking about the plot. Since this is not the classical love story we usually watch in a k-drama, things were definitely not going how is expectable in a standard love story. I found the writing true and intense, and I found the main leads appropriately suited for the characters they played. Even if the story can be liked or not, the characters can be liked or not. But as said, the key point of this story is the fact that it's not the typical love story, but something more adherent to actual feelings and personalities, even when disturbing. And this explains what can be found apparently bizarre or weird, mainly in what Seol does when dealing with Jung and In-ho.
Despite the story is well written, I actually felt disappointed by the ending. I found everyone getting their happy/bad ending or their redemptions, to include Seol. All but Jung: unknown. And that last second's (literally) happy ending disappointed me twice. Like if the story was eventually forced to show a potential happy ending (even if who's not Korean would find hard understanding who actually was the addressee of the messages: no sub no translation provided).
About the leads: I actually disliked Jung's character because I found him disturbing, creepy, and extremely toxic for his way to deal with wrong things and people doing wrong, manipulating the last ones till their humilation and destruction. I liked more In-ho, who is also a hothead (also a d1ckhead tbh): he uses his fists to solve problems, the violence is part of his way to express himself... But still: he looks more clear and genuine, and paradoxically less dangerous. To be honest: what can hurt more? A fist or a deep humiliation? Easy answer... So, again, both Jung and In-ho are truly in love for Seol, they try to did their best with her, but they both show toxic personalities, and despite the good intentions the outcome is (to be fine) questionable. Still, I found more and more dangerous and hurting Jung's personality, who's actually a sociopath. Simply, I prefer who is able to overreact showing his actual feelings, respect to whom overreacts wearing a mask, and manipulating and scheming. Both the actors were great, talented, and brilliant, personfying roles not easy to manage.
That said about male leads, talking about the shiny female leads, I adored Seol: Kim Go Eun was simply adorable in playing her controverse character. She has not a linear personality, she has a strong sense of duty and rationality as well as her approach to matters is unusual and sometimes harmful for herself: still I did not decide at the end if truly toxic as well, I mean toxic toward herself. Her tendence to justify and interiorize the actions of Jung is disturbing. Because his being toxic and manipulative trying to protect Seol, ends being harmful firstly to her. And what happened to her during the finale is a strong confirmation. Her ending is the only one not happy or redeeming: her life is sad, empty, she's clearly depressed, she keeps trying to keep in contact with Jung, despite he himself was the first admitting how harmful could be to her. And his having read the message at the end, honestly, I don't see it as an actual happy ending. As said above, Jung is the only one character for who's unclear if eventually able to redeem or not: will he hurt her again because he keeps being manipulative and toxic? Lee Sung Kyung, fantastic: she greatly played an In-ha who's a manipulative and a nihilist toxic (again) personality. Apart the beautifulness, she is really talented in characterizing, even when her character has an actual tragic nature masked by an apparent strenghtful temper.
I remained disappointed by the ending. I found everyone getting their happy/bad ending or their redemptions, to include Seol. All but Jung: unknown. And that last second's (literally) happy ending disappointed me twice. Like if the story was eventually forced to show a potential happy ending (even if who's not Korean would find hard understanding who actually was the addressee of the messages: no sub no translation provided).
In any case a show which deserves to be watched. Definitely.

P.S. The OST is beautiful