Island - Season 2

Long ago, Jeju was thrown into confusion by an outbreak of lust demons. Wonjeong, fated to save the island by establishing the Barrier, secretly visits and forms a friendship with two boys, Van and Gungtan, who were raised solely to kill lust demons. Ten years later, Wonjeong returns to Taejangsa Temple after completing her training to establish the Barrier. However, as soon as she starts establishing the Barrier, Jongryeong tries to burn Van and Gungtan, and the Taejangsa Temple becomes a scene of carnage.

Johan overcomes his despair after Chan-hee's death. Mi-ho, who is in pain and blaming herself, vows not to lose anyone else who is precious. From then, she begins receiving intense training from Geum Baek-ju at Granny Haenyeo's Home to regain the power of Wonjeong. Johan and Van follow Mi-ho but observe from a distance so that they don't interrupt her energy. Meanwhile, more of Gungtan's past and why the mysterious people awakened him are revealed.

Gungtan remembers once again that Wonjeong had sealed him in the past and escapes without being able to harm Mi-ho. Captivated by fear and anger, Gungtan begins to plunge the world into darkness. Mi-ho starts to blame herself, believing that the tragedy will only end when she dies. Meanwhile, illusions of Gusunsae cause Tamra High School students to engage in mass suicide. Despite Johan's effort to try to save the students, it wasn't enough. However, with the help of Butler Jang, Van and Johan work together and save the students.

Mi-ho finds out about Butler Jang's secret and tries to kill herself as she feels betrayed. The moment Van rushes to Mi-ho and holds her hand, she recovers all the memories from the past. Gungtan rages as he feels dejected after watching Mi-ho fail to regain power even after her memory has returned. Filled with madness, Gungtan prepares for the end by brutally killing the tramps he has given shelter to. Meanwhile, Butler Jang is remorseful for keeping a secret from Mi-ho and decides to leave the mansion.

Van learns that Mi Ho will vanish, leaving only Wonjeong, if she regains her power. After agonizing, Van tries to stop Mi Ho's training to become Wonjeong. Mi Ho is frustrated and upset with Van's sudden behavior. Meanwhile, Gungtan attempts to use Yeom Ji to find out about the location of the remaining Dol Hareubang, and Johan goes to Gungtan's hideout to fight him in order to save Geum Baek Ju and Yeom Ji.

It's finally the day to establish the Barrier. Mi Ho, on her way to the altar, fights a great battle against lust demons alongside Butler Chang, who has returned, and Johan, who woke up from a coma. After defeating countless lust demons, Mi Ho leaves the rest to Van, Johan, and Butler Chang and goes up to the altar, but her memories from the past and fear hinder her.