A man hacks a secret political slush fund of 2 trillion won for survival. An elite figure kills him for the fund, only to find it empty, leading to chaos and betrayal. True motives behind the slush fund emerge, leaving everyone vulnerable.

A young woman is visited by her thought to be dead father. Over three nights she dives into the mystery of her father's past where her own past, present and imagination collide into a dark fantasy that she will have to overcome, or she will become buried; buried just as her past once was.

Yoon Ga-Min is a student at a notorious vocational high school with many troubled students. He has the appearance of a model student with glasses, neat appearance, and innocent looks. He wants to do well academically, but his scores are always at the near bottom of the school. What he he lacks in book smarts, he makes up for in strength and fighting skills. To help improve his grades, he forms a study group. Whenever the members of his study group are in trouble, Yoon Ga-Min fights for them to keep his study group.

Dr. Jung Se-ok, a brilliant but disgraced neurosurgeon haunted by a past tragedy. Stripped of her medical license, she resorts to performing illegal surgeries in the shadows, driven by an insatiable thirst for pushing the boundaries of neuroscience. When her path crosses with her former mentor, the renowned but enigmatic Dr. Choi Deok-hee, old wounds are reopened and a dangerous game of power and revenge ensues. As Se-ok delves deeper into groundbreaking yet ethically questionable procedures, she grapples with the moral consequences of her actions, blurring the lines between medical necessity and personal ambition.

Jo I-na finds her uncle murdered beside a puzzle piece but can't explain her presence. Ten years later, as a criminal profiler, she investigates murders where victims are found with similar puzzle pieces.