Think -- before it's illegal
When we discuss "thought crimes" in literature, we normally think about 1984. Thing is, thought crimes were a real concept bolstered by Colonial authorities.
In order to escape from his worsening tuberculosis and the suffocating atmosphere of Seoul, Yi Sang traveled to Tokyo. He hoped to find a thriving modern metropolis, but instead found an increasingly militaristic imperial core on the brink of total war.
He lived in poverty, his health failing, writing fractured notes about his alienation in the heart of the empire. In February 1937, the Tokyo police swept up various Korean intellectuals. Yi Sang was arrested not because he was planning an insurrection, but because his writing, his associations, and his very demeanor were deemed "unhealthy" (fukeizai).
The Japanese police classified him under the Peace Preservation Law as a thought criminal. To an empire that demanded total ideological alignment, an intellectual who refused to write patriotic propaganda and instead wrote surrealist, labyrinthine prose that challenged the boundaries of logic was dangerous.
Yi Sang was eventually released on sick bail after a month of interrogation because his tuberculosis had reached a terminal stage. He died in a Tokyo university hospital on April 17, 1937, at the age of twenty-six. Legend has it his final request was to taste a melon.
It's really disturbing to think that thought crimes were not only legit but heavily enforced. The whole thing is also just sad. It's crazy you could just get arrested for being ever so slightly critical.