Morning inside Sora and Yuna's design-and-stationery shop, with shelves of paper, ribbon spools, ledgers, and sunlight across a worktable.

A routine delivery arrives at the shop, mixing paper bundles and documents on the worktable.

Sora discovers an envelope bearing the Lee household seal among the shop delivery.

Sora separates the Lee envelope from the shop records and tries to decide what to do with it.

Sora opens the misdelivered envelope, telling herself she only needs to identify the owner.

Sora reads the opening lines of Joon-seo's private correspondence to Lady Lee.

The letter reveals that Joon-seo is refusing Lady Lee's proposed matches.

Joon-seo writes that he cannot give another woman a place he once chose for someone else.

The letter names Sora directly, making it impossible for her to treat the correspondence as generic family politics.

The letter describes Sora correcting an account book at seventeen; the scene appears as a warm, stylized memory-visualization rather than a full flashback.

The letter recalls Sora giving her umbrella to a shivering page during the old engagement period.

The letter remembers Sora's fear and dignity at the engagement meeting.

Sora pulls herself out of the letter's memories and tries to dismiss them as strategy.

Joon-seo writes that choosing Sora was his own rebellion against his family.

Sora reads the letter again to see whether the meaning changes.

Yuna returns from the back room, forcing Sora to hide the letter and behave normally.

Yuna senses something is wrong, but Sora refuses to explain the Lee letter.

Sora carefully refolds the letter along its original creases to conceal that she read it.

Sora writes a neutral note claiming the document was unopened and misdelivered.

Sora arranges for the letter to be returned to the Lee household through a neutral courier.

At closing time, Yuna gives Sora one more chance to talk. Sora refuses without hostility.

That night, Sora lies awake as the letter unsettles her old certainty about Joon-seo's silence.

Sora realizes that the letter does not erase her pain, but it changes the question she never asked.

The next morning, Sora returns to work and pretends the letter never happened, though the doubt remains.