Start today. Write down the worst thought you had in the last hour. Then, look at it. And ask yourself: Is that thought a fact, or just a habit?
The Bad Thinking Diary leverages a technique called . Coined by Acceptance and Commitment Therapy (ACT), defusion is the process of separating yourself from your thoughts. When a thought is looping in your brain, you are the thought ("I am stupid"). When you write that thought down in a diary, you become the observer of the thought ("I notice I am having the thought that I am stupid"). Bad Thinking Diary
Min-ji woke up breathless, the neon lights of the city bleeding through her dorm room curtains. Her heart hammered against her ribs, the ghost of Yuna’s touch still warm on her skin. It was another "bad thinking" night—the kind where her mind blurred the line between friendship and something far more dangerous. She reached for her diary, but her hand stopped. How could she put into words that she was falling for the person who had been her anchor since high school? The Lecture Start today
. After Min-ji starts having vivid, "bad" dreams about her best friend, their once-innocent bond spirals into a complex web of secret desires and crushing miscommunications. And ask yourself: Is that thought a fact, or just a habit
The artwork plays a crucial role in conveying this atmospheric tension. The character designs are soft and expressive, often contrasting with the heavy, evocative themes of the plot. The use of lighting and color shifts frequently to mirror the internal states of the characters—bright, nostalgic hues for childhood memories and darker, more saturated tones for the moments of modern-day conflict or intimacy. This visual storytelling highlights the psychological weight of their "bad thoughts," making the reader feel the gravity of every stolen glance and unspoken word.
The story is told largely from the perspective of , who has grown up deeply insecure and jealous. She has always felt overshadowed by her best friend, Hyejin , who is beautiful, popular, and seemingly perfect. Yuna harbors a "bad thinking diary" in her mind — a constant stream of bitter, envious thoughts about Hyejin, convinced that Hyejin looks down on her or pities her.
Whether you are struggling with clinical anxiety, navigating the pressures of a high-stress career, or simply seeking a deeper understanding of your own psychology, the Bad Thinking Diary—often referred to in clinical settings as a Thought Record or Dysfunctional Thought Record—offers a structured path to mental clarity.
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