About Him
Jin is the second child in the Millais family. Jin and his twin brother lived a life of abuse at the hands of their parents. He was often physically and verbally abused. In some situations his parents would threaten to kill one of them if they did something wrong. As a result, Jin became very protective of his twin brother.

One night, when the rest of the family was asleep, Jin vented his anger. He entered his parents' bedroom. To avenge the mistreatment he and his twin brother had received, Jin cold-heartedly killed both of his parents. No one knew what had happened, not even the authorities. It was agreed that the death of Jin's parents would be an internal matter between the two of them. It has nothing to do with Jin and Voyager. And because of that, Jin is not suspected of anything, even though everything that happened was his fault.

Personality
At first glance, Jin appears to be a quiet and reserved person. He doesn't show much change in his expression when he's with others. Jin also tends to be the type of person who only speaks when he needs to. However, this is not the case when Jin is with his twin brother.Although he remains stiff, there is a significant difference between the way he behaves with other people and with his brother. Jin will be a good listener when his brother share a story. He is also very protective, to the point of being overprotective of his brother. In some situations Jin would be hostile. For example, if his twin brother's safety is threatened, or if he's in a very bad mood.

Jin believes that he has saved his brother from the trauma and abuse caused by their parents. He sees himself as his brother's saviour. This makes him constantly try to protect his twin brother in every situation without exception. He would become very frustrated if Voyager refused his help or even became angry at him.

Trivia
× He refuses to use the same style/outfit as his brother, but he won't refuse if Voyager wants him to use a matching outfit.
× He will do literally anything for his brother, including killing.
× He mostly uses his left hand, but can also use his right. He uses it when swinging a bat.
× He was a member of the baseball club in high school. Although he was only good at swinging the bat.
× His favorite song is Unravel by Toru Kitajima and his favorite book is The Metamorphosis by Franz Kafka.