When cellist Su-yeon vanishes, her fiancé Sung-jin finds solace in Mi-ju, her replacement. As their forbidden passion intensifies, they commit an unforgivable act-unaware that Su-yeon is trapped within the walls, watching every betrayal. As dark secrets unravel, love and vengeance blur, leading to a chilling reckoning.
When cellist Su-yeon vanishes, her fiancé Sung-jin finds solace in Mi-ju, her replacement. As their forbidden passion intensifies, they commit an unforgivable act-unaware that Su-yeon is trapped within the walls, watching every betrayal. As dark secrets unravel, love and vengeance blur, leading to a chilling reckoning.
