A working single mother comes home one day to find that her daughter and the nanny have disappeared -- and this is just the beginning of her nightmare.
Journalist Sang-jin uncovers the existence of the so-called 'Troll Factory' while investigating an online public sentiment manipulation story, and is confronted with an unbelievable truth.
Hyun-ah is listed on top ten of TV audition program with talented voice and attractive appearance. The reason why she is in this show is to be shown to her mom, Jang-mi, who has been separated for over 10years. Jang-mi used to be a potential singer long time ago but had to give up her dream due to her responsibility she had to take at that time. They had lived together happily even in poverty until something happened bringing their parting.
Su-yeon, a cellist in an orchestra led by her fiancé and conductor Sung-jin, disappears one day, leaving behind only a video recording. Sung-jin is devastated over the loss of Su-yeon, but feels a strong attraction to Mi-ju, a cellist who fills in for his fiancée. Then one rainy night, Sung-jin and Mi-ju get swept away by their mutual desires for each other and commit an unforgivable act at Su-yeon’s house. Meanwhile, Su-yeon, who is thought to have gone missing, remains trapped in a secret room inside her house, and watches the naked truth unravel before her.
