The brothers reunite with Haerin after 30 years, only to discover she has lost all memory of them due to the sleep project's memory optimization, revealing she chose to forget her painful past.Will Haerin's memories return, and how will the brothers make amends for their past mistakes?

Haerin, the youngest daughter who lost her memory and identity, faces her siblings' regret and plea for reconciliation after years of separation, but she chooses to seek her own happiness instead of returning to her family.Will Haerin ever regain her lost memories and reconcile with her family?