A man with the power of resurrection. 31 years old / 173cm He is a job seeker who returns home after failing yet another interview, only to be killed by mysterious men. He resurrects 72 hours (3 days) later and discovers his ability. Every time he dies and comes back to life, his hair turns red and his strength increases, eventually gaining enough power to blow an opponent away with a single punch. He is surprisingly positive, sly, and playful. He has a short fuse and cannot hold back his temper in unfair situations or in front of interviewers. He cherishes his younger sister dearly. He wasn't that strong at first, but his power keeps growing (initially he just knows how to fight a bit, but later he can crush a handgun with his bare hands). He lives in an old villa apartment. He is being hunted by a massive organization called Noah. Noah extracts Seok-hwan's spinal fluid to create human weapons and uses it for their own profit. He possesses the demeanor of a playful madman even in life-threatening situations. An orphan, he was adopted and raised by Cha Hyeong-seok (Hiroshi). He calls Cha Hyeong-seok 'Ajusshi'. It seems he does so because they aren't biologically related.

The younger sister of the man with resurrection powers. 19 years old / 164cm She supports her brother's job search more than anyone and trusts him no matter what. She possesses excellent computer skills and is a smart, reliable sister who actively conducts research for Seok-hwan, who fails his interviews time and again. On the surface, she treats him like he's pathetic and foolish, but deep down, she trusts her brother the most. Although a high school student, she is mature and extremely calm, though she can be emotional at times. Her father is Cha Hyeong-seok (Hiroshi).

The man chasing the resurrected man. Mid-30s / 187cm He is fluent in three languages, including English and Japanese. He possesses the transcendent ability to control others at will, but this power uniquely fails to work on the protagonist Seok-hwan, who resurrects every 72 hours. He will stop at nothing to capture Seok-hwan. He can be considered the final boss (extremely powerful). He was originally a test subject of Noah, a secret bio-research lab that modified children for the purpose of developing human weapons and achieving eternal life. Hiroshi, a former researcher, escaped the lab with Red (Seok-hwan), who possessed resurrection abilities, and raised him. Black, acting under the organization's orders, is now hunting Red to bring the escaped subject back to the lab.

The best friend of the resurrected man. Early 30s / 178cm Seok-hwan's irreplaceable friend and a capable professional in the workplace. He is a loyal friend who doesn't hesitate to give Seok-hwan harsh reality checks, yet steps up before anyone else when Seok-hwan is in danger. One day, Young-ha discovers that Seok-hwan, who had been out of contact for three days, has the power of resurrection. He is the only best friend who offers blunt criticism and realistic advice to the protagonist Seok-hwan, who fails every interview. Unlike the superpowered individuals, he is a realistic office worker living a fierce daily life. He is an excellent driver and tends to swear a lot. He runs a boxing gym and his combat skills are quite good since he boxes (his evasion and punching skills are well above those of an average person).

Mid-60s / 178cm He is Cha Ye-rin's biological father, and although he is not Seok-hwan's biological father, he raised him like his own son. He appears to be an ordinary person, but he was actually Dr. Hiroshi, a Japanese researcher who worked at Noah, a secret bio-research lab that modified children for eternal life and human weapon production. However, after seeing Noah's endless experiments on children, he fled with Red (Seok-hwan) and raised him.