An unpredictable, brilliant romance that awakens frozen time when a man named 'Chan', who lives every day like an exciting summer vacation, and a woman named 'Ran', who has locked herself in winter, meet as if by fate.

Set during the Joseon Dynasty, the story of the meeting between the young widow Jung Soon-deok and young widower Shim Jung-woo as well as the struggle the two go through together to marry off the four young maidens who represent Joseon.

When Jaehee, a top call girl at a club in Gangnam, goes missing, Detective Kang Dongwoo returns to crack the case. Prosecutor Min Seojin aims to rise in rank, while the notorious pimp, Yoon Gilho becomes a prime suspect. They unravel a web of secrets and connections behind the case.

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.