Is it a dream or reality, is what she encounters her imagination or her lost memory. The heartache and tears every time she wakes up from the dream urge her to find the truth and the person in the dream who she can't let go of. Is he who comes back to save her or is he the one who redeems her?
Concept: Through a series of immeasurable events triggered by the protagonist's constant search and exploration of the truth she wants, the person she wants to redeem is also redeeming her.