Jongin is a brokenhearted guy with scars scraping both his mental state and physical body. Seulgi is an enthusiastic student, merely doing research for her final task.

This is the world where the boundary between strangers and friends is hazy and obscure. Everyone will have different stories to unravel, build upon their intention.

This is Vault. An application where strangers with multifaceted experiences, scars, expectations, and identities meet and develop relationships based on how far they can maintain their persona.

What happened when they both met as anonymous in Vault?