MTL - Unfathomable Doomsday - ~ 45th massacre

Su-jin is a high school student whose life is filled with loneliness. Weighed down by school bullying, personal struggles, and isolation, she finds herself growing weary of everything. At that moment, a mysterious shadow enters her life—a man she only sees in her dreams, through his face remains hidden. Surprisingly, his influence extends beyond her dreams, shaping her into a stronger, braver, and happiest person.As time passes, Su-jin finds herself drawn to him, yet his presence brings more than just emotions—it leads her to extraordinary friendships and unexpected adventures.Among them is Yeong-ae, a skilled spy who enrolls in Su-jin's school to investigate the mysterious death of a girl named Ha-na. And then there is Jung-hee, a young detective who begins working as an undercover high school student on a major case. Along the way, she unexpectedly meets Su-jin, which gradually develops into a deep friendship.Day by day, Su-jin's life becomes like an adventure book; each page of which becomes an unfolding adventure filled with excitement, romance, secrets, challenges, and discoveries. But in the midst of this mystery, will she ever find the invisible man who stole her heart?

After being set up and killed by her half-sister whom her ex-boyfriend had cheated with, Mu Siyin woke up one day to discover that not only was she alive, but she had traveled back in time to 2 years before her death.

“I’ve been possessed into the controversial makjang drama ‘Gwangin’ (The Lunatic). Of all roles, I’m the omega secretary to an alpha with omega-phobia. It’s hard enough hiding my identity, but I’m also in charge of all sorts of annoying tasks: managing the protagonist’s diet, wardrobe, and house; coaxing and soothing the beta he loves. My goal is to survive until the ending where the protagonist meets the strange beta who thinks even his obsession is love, leading to a happy ending… I think I smell an omega somewhere.’ ‘That’s… impossible.’ If I speak carelessly, I die. If I mess up my work, I die. If I run away, I die. And if the fact that I’m an omega is revealed… I really die. ‘Right. It shouldn’t be possible, but that’s why I feel so f*cking awful, Secretary Kim.’ Will I be able to make it back alive…?”

Yin Xun wanted to read a light-hearted novel, only to be tricked by the synopsis. It turns out that it was an abusive plot, with the male lead causing the female lead’s family to fall apart, while he imprisoned her with domestic violence and subjected her to all sorts of torment…

only for them to live happily ever after!Finishing the book, Yin Xun complained about the female lead: If I could transmigrate into the book, I will slap you in the face so that you would wake up! What an idiot! Bleurgh! And yet, she transmigrated into the book in the next instant and became the nonexistent sister of the female lead, leaving her speechless. Is it that costly to voice a complaint these days?! She had to transmigrate as payment?!Still, what happened had happened. Rolling up her sleeves, Yin Xun looked at her adorable family and prepared herself to torture the male lead…

but at the next instant, her wish came true, as the first slap she gave was to the female lead!What do you mean, we’re rich, and it was no skin off our back, so we don’t need to give any compensation? This was the starting point of our downfall! Realizing that the female lead was a little skanky and very much deserved to be tormented, Yin Xun decided to straighten her out along with the male lead. Nonetheless, she wanted a trade empire for herself as well, since she couldn’t allow her life to revolve around those two…

but a certain big-shot got upset as her business began to take off: “What is more important? Me, or your ambition?”Yin Xun: “So, are you cutting ties with me?”Seeing that she did not get what he was saying, the big-shot sighed: “No.”The path of wife-chasing was a long one for him!