有害与心
Three Days of Confession (Harmful and Heartfelt)
Selection and click challenges are conducted in units of three game days before graduation.
Mind Switch (有害與心)
The ending vocal song for 'Harmful and Heart' is performed by the voice actor 이이로 of Hong On-seol.
이이로
이이로 participated in voice acting and ending vocals in "Harmful and Heartful."
LeoN（마음스위치）
The artist who released '마음switch' was credited.
Digital Cakeshop
Digital Cakeshop participated in the development and publishing of "Harmful and Heartful."
Hongonseol (害與心)
The protagonist's only friend, and also the person he had secretly loved for two years. After graduation, she is about to move, and her contact before leaving prompts the protagonist to return to school; She personally loves cute things.
harm to the heart
"Harmful and Heart" (심장에 해로워) is Digital Cakeshop's first visual novel. The story centers on a boy who faints at the sight of cute things, and players must help him confess to his friend Hongonseol within three days before graduation; The Steam version will be released on February 20, 2026.