Island - Season 1 (2022)

Mi-ho meets the last of Benjulle's trees after a fierce battle in Benjulle's forest. Mi-ho returns to her villa after saving Su-ryun and starts planning on how to punish Gyeong-jun.

Ban feels guilty for nearly killing Mi-ho and disappears into the darkness. To find Ban, Mi-ho goes through rough mountain tracks to Taejangsa Temple, only to walk away after being hurt by his coldness.

Yohan brings Chan-hee to the villa. They spend time happily together, promising each other that they would not part again. However, Chan-hee has already turned into a lust demon, and he leaves Yohan's room to go after Mi-ho's life.

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, Ban 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.

Yohan 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. Yohan and Ban follow Mi-ho but observe from a distance so that they don't interrupt her energy.

Gungtan begins to plunge the world into darkness. Mi-ho starts to blame herself, believing that the tragedy will only end when she dies.

Mi-ho finds out about Butler Chang's secret and tries to kill herself as she feels betrayed. The moment Ban rushes to Mi-ho and holds her hand, she recovers all the memories from the past.

Ban learns that Mi-ho will vanish if she regains the power, leaving only Wonjeong. After agonizing, Ban tries to stop Mi-ho's training to become Wonjeong. Mi-ho is just frustrated and upset at Ban's sudden behavior. Meanwhile, Gungtan attempts to use Yeom-ji to find out about the location of the remaining Dol Hareubang, and Yohan goes to Gungtan's hideout to fight him 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 Yohan, who woke up from a coma. After defeating countless lust demons, Mi-ho leaves the rest to Ban, Yohan, and Butler Chang and goes up to the altar, but her memories from the past and fear hinder her.