Yuna is beautiful, wealthy, popular, and fiercely protective of Minji. Beneath her perfect exterior lies a calculated, deeply possessive personality. Yuna cannot tolerate anyone else getting close to Minji. She uses her charm, wealth, and emotional leverage to keep Minji isolated and dependent on her, making her one of the most compelling "yandere-lite" archetypes in modern GL. 3. Supporting Cast
Unlike a traditional journal that aims for accurate emotional reflection, a Bad Thinking Diary is biased. It thrives on exaggeration and catastrophe. It takes a minor mistake—sending an email with a typo—and enters it into the diary as definitive proof of incompetence.
Bad Thinking Diary is more than just a romance webtoon; it is a thrilling psychological ride. It takes the familiar comfort of a childhood friendship and twists it into a gripping exploration of obsession, jealousy, and passion. If you are looking for a GL story with high-tier artwork, complex characters, and a plot that keeps you guessing, this series deserves a spot on your reading list.
: Depending on the medium, assess the quality of writing or artwork. Is the narrative engaging and well-paced? If it's a visual work, is the art expressive and well-executed? Bad Thinking Diary
is one of the most widely discussed, visually stunning, and highly polarizing entries in modern Girls' Love (GL) Korean manhwa . Written by Park Do-han and illustrated by the ultra-popular artist Rangrarii , this digital comic originally serialized on platforms like Lezhin Comics. It quickly became a massive viral sensation across TikTok and global sapphic reader communities.
The illustrator excels at drawing expressive facial close-ups that convey unspoken tension, longing, and malice. The shifting color palettes—bright and warm during public campus scenes, but dark, moody, and intense during private confrontations—enhance the overall dramatic atmosphere. Cultural Impact and Reception
The manhwa handles the theme of sexual discovery with raw honesty. Minji’s struggle is not just about loving Yurim, but also about coming to terms with her own sexuality in a world that assumes she is straight. Art Style and Visual Storytelling Yuna is beautiful, wealthy, popular, and fiercely protective
Rangri’s artwork is highly praised within the webtoon community. The art style utilizes a vibrant, clean aesthetic that contrasts sharply with the heavy, psychological undertones of the plot.
No romantic drama is complete without an obstacle, and Bad Thinking Diary delivers a memorable one in Oh Hye-ra. With her distinctive pink hair and provocative style, Hye-ra is a manipulator who thrives on controlling the relationships of those around her. Nursing a secret crush on Yu-na, Hye-ra devises a plan to break up Min-ji and Yu-na. Her presence injects a dose of scheming chaos into the narrative, representing the external pressures that threaten the protagonists' fragile new bond.
Start today: keep the diary where you’ll actually use it — a small notebook, a notes app, or a sticky on your monitor. Do one entry when a thought spikes your mood; three entries a week add up fast. She uses her charm, wealth, and emotional leverage
It is impossible to discuss Bad Thinking Diary without praising the artwork by Rangari. The visual storytelling does heavy lifting in establishing the webtoon’s distinct mood.
No romantic drama is complete without obstacles, and Bad Thinking Diary delivers in the form of Oh Hye-ra, the series' primary antagonist. With her distinctive pink hair and provocative attire, Hye-ra is a manipulative figure who harbors a crush on Yu-na. Her plan involves using Cho Min-jae—a young woman completely subservient to her—as a pawn to drive a wedge between Yu-na and Min-ji.
The series is widely known in the Yuri community for its high-quality art but polarizing narrative.