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Heartbroken Estong gets mugged after drowning his sorrows with strangers, but the mysterious Ysa saves him. When her painting goes missing, she suspects him. As they search to clear his name, a series of twists reveals Ysa is far from an ordinary girl.

Estong finally learns more about Ysa and her DID, and decides to join her search while becoming more familiar with her alters. After another challenging day, Ysa's hope of finding the missing painting begins to fade until an unexpected turn gives them a reason to keep going.

Ysa braces for disappointment after failing to recover the painting until Estong comes to her rescue. The alters ask for his help to complete their masterpieces for the exhibit. As they spend more time together, Estong and Ysa develop feelings that go beyond friendship.

After Ysa rejects Estong, she spends her days avoiding him. Respecting her boundaries, Estong chooses to value their friendship instead. But despite their efforts to hide their feelings, Ysa’s long-kept secret is finally revealed, changing everything.

Belle returns with no memory of Estong. Missing the other alters, Estong does everything he can to bring them back. Meanwhile, Belle resumes her life, unaware of how much time has passed since Ysa took control of her body.

While Estong tries to win Belle's heart, Lorenz seems to have the upper hand. He proposes a documentary about D.I.D, with Belle as the case study. Despite Estong's skepticism, Belle chooses to push through with the documentary and tell her own story.

Belle decides to apologize to Estong, but this time, he is the one pulling away from her. Seeing the distance between them, their parents arrange for the two to have a one-on-one conversation. However, their plan falls apart when an unexpected obstacle catches them off guard.

Consumed by guilt over Estong’s accident, Belle returns to her childhood home, determined to escape her pain. But a mysterious stranger appears, changing everything.