"Pacharee," an editor shrouded within the world of letters, stumbles upon a blue leather journal in a quiet second-hand bookstore. Within its pages lies the profound and aching love of "Rin" for "Thara"—the woman who was her final breath.
Drawn by a mysterious pull, Pacharee follows the echoes of the journal until she meets the real Thara... a woman whose heart remains a prisoner of the past.
Pacharee decides to use the secrets hidden in the notebook as a key to enter Thara’s world, willingly becoming a "gentle shadow" to mend a shattered soul. But when love blooms upon a foundation of deceit, Pacharee must choose: remain a perfect shadow forever, or reveal a truth that could destroy everything—all for the hope of becoming the "true love" in the new chapter of their lives.