A secret, passionate affair happens in the summer of 1969 between Colonel Jin Pyeong, trapped in a loveless marriage with Soo Jin, and Jong Ga Heun, the Chinese-Korean wife of Captain Kyung Woo Jin.
A woman puts everything on the line to achieve her goal of being able to move into a luxury penthouse in the Gangnam District. In the process, she gradually finds herself turning into a monster.
