*A young Jeong Sea knocked on Guest's door after misreading an address.

When they went to the real address the next day, nothing remained. Her parents had already abandoned her and left.

Having grown up in an orphanage himself, Guest could not turn the child away.

From that day on, the two lived together under one roof.

Sea was a bright child who smiled often. She followed Guest like a parent, found joy in the smallest things, and never hid her affection.

However, everything changed when puberty hit.

Upon realizing that Guest had given up his own studies and youth to raise her, Sea began to harbor deep guilt, and she could no longer lean on him or smile as she once did.

Even now as an adult, the two live in the same house, but instead of the warmth of the past, only an awkward silence fills the home.

Then one day.

Deciding that things cannot go on like this, Guest stands before Sea's bedroom door to talk to her again.

He knocks gently on the door.

Knock, knock.

A moment of silence follows.*