Bad Thinking Diary !full! | PLUS — 2026 |
| Date and Time | Situation | Bad Thought | Emotions | Cognitive Distortion | Evidence For/Against | Alternative Thought | | --- | --- | --- | --- | --- | --- | --- | | 2023-02-15, 10:00 AM | Made a mistake on a project | "I'm a complete failure. I'll never succeed." | Anxiety (8/10) | All-or-nothing thinking | Evidence against: I've succeeded in many projects before; one mistake doesn't define my abilities. | "I made a mistake, but I can learn from it and do better next time." |
A junior architect known for her patience and "can-do" attitude. She is the friend who always says, "It could be worse!" The diary is her secret rebellion against her own perfectionism. As the story progresses, her "bad thoughts" stop being just thoughts.
Meanwhile, Min-ji, who is new to love and eager for romantic experience, accepts a date with a man. But the memories of her lustful dreams and the way Yu-na makes her heart race refuse to leave her mind. Filled with confusion, Min-ji decides to confront Yu-na about her feelings, leading to a pivotal moment that changes everything. Bad Thinking Diary
To understand why Bad Thinking Diary captured such a massive audience on Lezhin US, one has to look at the appeal of melodrama in romance fiction.
Yuna presents a calm, collected, and fiercely protective exterior. She acts as Minji’s anchor, but underneath her composed facade lies a deeply possessive streak. Yuna’s affection for Minji borders on obsession, and she is willing to manipulate situations—and people—to keep Minji firmly within her orbit. Her character subverts the "perfect protector" trope, revealing the darker, more controlling sides of codependency. Key Themes Explored | Date and Time | Situation | Bad
"Bad Thinking Diary" revolves around the intense bond between two main characters, Yuna and Minchae. The narrative expertly explores the "Define the Relationship" (DTR) trope, focusing on how a lifelong friendship can evolve when one, or both, partners begin to harbor deeper romantic feelings.
Initially appearing as the more "innocent" or confused party, Min-ji’s character arc is a fascinating descent into accepting her own desires. Her internal monologues provide the "Diary" aspect of the title, letting readers see her mental struggle firsthand. She is the friend who always says, "It could be worse
What makes Min-ji compelling is her relatability. Her admiration for Yu-na is evident from the beginning, but it's her internal struggle—the push and pull between fear and desire—that forms the crux of the story. As time passes, she gradually evolves, gaining a deeper understanding of herself and what she truly wants. This transformation from a shy, uncertain young woman to someone who can articulate her needs is one of the manhwa's strongest arcs.
Minji’s initial denial represents the classic struggle of coming to terms with one's sexuality. Labeling her romantic and physical desires as "bad thoughts" underscores the societal and internal pressures to conform to platonic norms. Artistic Style and Presentation
| Feature | Bad Thinking Diary | Moonlight Garden | What Does the Fox Say? | | :--- | :--- | :--- | :--- | | | Best friends to lovers, drama | Forbidden love, class divide | Office romance, enemies to lovers | | Art Style | Modern, highly detailed, sensual | Elegant, ethereal, floral | Sexy, glamorous, polished | | Key Strength | Intense emotional vulnerability | World-building & slow-burn romance | Strong, complex female characters | | Main Criticism | Frustrating miscommunication | Slow pacing, political plot | Toxic first half of the relationship |
As one reader put it: "This is the manga/manhwa/webtoon that got me fully into the Yuri genre (for obvious reasons)". Sometimes, that's the highest praise a work can receive.