Yunjae was born with a brain condition called Alexithymia that makes it hard for him to feel emotions like fear or anger. He does not have friends—the two almond-shaped neurons located deep in his brain have seen to that—but his devoted mother and grandmother provide him with a safe and content life. Their little home above his mother’s used bookstore is decorated with colorful Post-it notes that remind him when to smile, when to say “thank you,” and when to laugh.