- Bad Thinking Diary is a manhwa written and illustrated by Park Do-han. It was published by Lezhin.
Min-ji and Yu-na have been best friends since high school, and Min-ji counts herself lucky to have someone so pretty and kind in her life. She just knows that when she finally starts dating, she wants it to be with someone as amazing as Yu-na! Everything seems perfect, but things start to change when Min-ji begins having dirty dreams… ones starring Yu-na herself! Min-ji chalks it up to her own loneliness, but for some reason Yu-na starts acting strangely when Min-ji tells her about it… Is she upset, or could it be that Yu-na has harbored feelings for Min-ji all along? From unrequited love, excitement, and obsession, just where will these bad thoughts lead them?
Main Characters:[]
Kang Yu-na[]
Kang Yu-na, an exquisite and statuesque lady, possesses lustrous black hair and captivating blueish-gray eyes. Her preference for darker attire is a common sight. At the age of 21, she finds herself enamored with Kim Min-ji. Yu-na exudes self-assurance and carries herself with dominance. In her youth, she had endured unpleasant encounters with men, as her former boyfriend sought retribution when she ended their relationship. However, due to the intervention of Kim Min-ji, Yu-na was spared from any harm.
Kim Min-ji, an adorable individual with a charming appearance adorned by light brown hair and captivating green eyes, often dons vibrant attire. At the age of 21, she develops an affection for Yu-na. Initially, when Kim Min-ji begins to envision Yu-na in her dreams, she experiences a profound shyness. However, as time passes, she gradually evolves and gains a deeper understanding of herself.
Kim Min-ji[]
Oh Hye-ra[]
Oh Hye-ra is portrayed as the primary antagonist in the series. With her distinctive pink hair and eyes, she often dresses in provocative attire. At 21 years old, she exhibits concerning behavior and is known for engaging in numerous romantic relationships with various women. Unafraid to explore dominant-submissive dynamics, she actively participates in sadomasochistic practices. Hye-ra has a crush on Yu-na. Hye-ra's plan is to break up Yu-na and Min-ji by using Min-jae. She hates it when she sees Yu-na and Min-ji in love.
Side Characters:[]
Cho Min-jae[]
Cho Min-jae is a slave of Oh Hye-ra. She's also currently an antagonist with red hair and goldish eyes. She is totally subservient to Oh Hye-ra and would do anything to get her attention, which makes her an accomplice in Oh Hye-ra's schemes against Yu-na and Minji. Only later does she realize that Hye-ra doesn't love her but only uses her for her own purposes.
Han Ji-hoon[]
Han Ji-hoon is Min-ji's old love interest. He looks just like Yu-na.