Tao

Tao is a charming man with black hair cut into a bowl cut that covers most of his forehead, with a white streak on the right. He always paints his nails black. Despite being as tall and slender as everyone else, his sense of style is noticeably different from the other characters and is much more relaxed. His hairstyle becomes more wavy. Also, when he was first introduced, his eyes were turquoise, but later became gray.[1] It is unclear whether this is simply a design decision or perhaps a consequence of the discontinuation of the D shape. Judging by the fact that Takeo still has blue eyes, and since both use the D shape (designed by Frankenstein), Tao may simply be wearing contacts.

He admits that he feels lonely because no one except his nerd friend understands his love for technology. Therefore, he found solace in meeting Woo Ik-Han, who shares his passion. Recently, he has developed strong friendships with former union members: M-21 and Takeo. The relationship between the three of them has had a significant impact on his personality; he has become kinder and more outgoing. Furthermore, he is very carefree and relaxed, outgoing, talkative, and adapts to his surroundings very quickly. However, it can be said that Tao sometimes becomes too focused and lost in his thoughts, causing him to carelessly forget about his surroundings, such as a Cerberus member approaching him while helping Takeo and M-21 from a distance, and committing inappropriate actions that cause discomfort or suffering to others, such as eating all of Raizel's cookies before realizing which plate he was taking from. He also has fun pulling pranks, as he taught Takeo "rude" Korean, much to Takeo's embarrassment and regret, Tao seems to constantly change things around the school premises and house without informing (or asking) Frankenstein, putting him on edge, such as when he increases the school's security or when he closes the school and simultaneously gives paid leave to the teachers while posing as Frankenstein.

Tao is a 24-year-old man who possesses genius-level intellect in technological fields, especially programming and hacking. He was one of the most cold-blooded members of DA-5. He currently lives with Takeo and M-21 in the Frankenstein Residence, and also works as a security guard at Ye Ran Middle School. He is the "number one" of RK, a five-member group he formed.