179cm He has blue eyes and white hair in a tidy bob cut. He wears a blue and white turtle neck.
He is very caring, even so far called like a mother. It seems that he has a violent side to him however, as one of Osu's servants mentioned Number 1 being a punk in the past. One of these stories includes Number 1 knocking out three of Osu's father's teeth out by throwing a chair at him.
In the past, He was experimenting with human bodies with others of his clans, but unlike Number 2., he was friendly with them, so he was squeezed every time he complained about human beings.
At some point, however, he came to the town of Swan and lived as a Doctor. At this time, suddenly, his body was cut off by a murderer, he resurrected but when the villagers saw him, they became frightened and began avoiding him so he left the village.
After a few decades, he began to live in Osu 's house. He was very respected in this house because he saved Osu's grandfather from death. He became a mother-hen in this period because Osu needed that.
- Immortality: Number 1's species is immortal, unable to get sick, injured, or get killed. Any physical wounds their species receives will be restored immediately, along with severed body parts attaching themselves back together.
- Healing: Number 1, along with his siblings, possesses more powerful healing abilities than any other healer in SPOON. This is due to the siblings being immortal, meaning the life energy required for healing never decreases. He can heal injury, reattach limbs, purify viruses, germs and dirts and is seemingly limitless. This healing is a special skill that transfers its life energy, the twins have a infinite amount of life energy so... This abilty can cure the trauma but not the disease.
- Number 1. : He loves his brother . In order to prevent his brother to meet with Baekmorae, he tried to kill Baek the him, saying that it's because he is the big brother, and he help SPOON to make atonement for Number 1. sin.
- "Number 1." isn't a code name, it's his real name.
- He is a really good cook.
- He really love plants very much, He even makes artificial lighting in the basement of his home and creates a large garden. He doesn't like trims the trees branches because it would be like cut off their fingers to make them look pretty.
- Bidan have 200 years of difference with him and Number 2.
- He have a cooking blog