Chapter 2

An illegal "night courier" who works under the alias "Healer". Renowned for being the best in his field, Jung-hoo is equipped not only with advanced technology and a trusty hacker sidekick, but also his superb fighting skills. He will perform any task except anything involving murder. His ultimate goal is to save money and buy an uninhabited island off the coast of Panama and to live there alone, but that changes after being given an order by his client, Kim Mun-ho, to find and protect a girl named Young-shin from the people who want her dead but he later falls in love with Young-shin.

Park Min-young as Chae Young-shin / Oh Ji-an

Kim So-yeon as young Young-shin

Shin Soo-yeon as 10-year-old Ji-an

Park Ji-so as 8-year-old Ji-an

Ku Geon-min as 5-year-old Ji-an

A strong-willed and quirky internet news reporter who dreams of becoming a legendary reporter. However, her dreams are put to the test when she finds out about her hidden past as the lost child Oh Ji-an. Due to her abusive past, Young-shin is traumatized and suffers from panic attacks whenever she sees violence. She later falls in love with her protector, Jung-hoo.

Yoo Ji-tae as Kim Moon-ho

Kim Seung-chan as young Moon-ho

Lee Woo-joo as child Moon-ho

A star reporter, and brother to Kim Moon-sik, the CEO of a large news company. His goal is to last each day and to find Oh Ji-an, a supposedly dead child whom he suspects to still be alive. He pays Jung-hoo (as "Healer") to find and protect Ji-an (now known as Young-shin) from the people that want her dead, out of guilt for not fully investigating the truth about a 1992 incident that ended in the tragic deaths of two out of five best friends, and the crippling of a third.

Kim Mi-kyung as Jo Min-ja, Hacker Ahjumma, a former detective specializing in cyber crimes.

Oh Kwang-rok as Ki Young-jae, Jung-hoo's teacher (and the first "Healer"), one of five friends from the past.

Choi Dong-gu as young Young-jae, Motorcycle rider and distractor during the illegal radio broadcasts.

Taemi as Kang Dae-yong, "Healer's" assistant.

Ji Il-joo as Seo Joon-seok, Jung-hoo's father, an engineer of the illegal radio station and later a photographer working with Oh Gil-han.

Lee Kyung-shim as Jung-hoo's mother

Song Ji-in as young Jung-hoo's mother

Park Sang-myun as Chae Chi-soo, Young-shin's adoptive father, a lawyer specializing in defending clients accused of burglary who also runs a café where he has employed many of his former clients.