Lee, who is of Korean and Singaporean descent, warned that harsh words can “destroy” lives, and said everyone needs to be careful when posting online.
“I don’t understand why people feel the need to spread negativity and ill wishes to another person, whom they have never even met,” she wrote.
“Your words can uplift and heal someone but they can also knock down and destroy someone. Please, think twice before you speak. It could save someone’s life.”
Kimura’s last post on Instagram was a picture of herself and a cat with the message: “I love you, have a long, happy life. I’m sorry.”
In South Korea, cyberbullying made headlines last year when two female K-pop stars committed suicide after facing online attacks.