Aka：A Face / 隐藏的面孔 / 窺鏡 / 破.鏡.慾 / เล่ห์ ร้อน ซ่อน ชู้ / Скрытое лицо / Fețele ascunse / Người Giấu Mặt
Summary：Seong-jin, a conductor, and Su-yeon, a cellist, are engaged. Su-yeon disappears, leaving a video. Mi-joo replaces Su-yeon and develops a secret relationship with Seong-jin. They feel watched as their bond deepens.
