My Wife’s Excuse (2016)

Newlyweds Ji-hee and Nam-soo are trying to conceive, but they are troubled when Ji-hee is diagnosed with infertility. Hearing about their struggles, Sang-hyeon works with a female employee, Mi-yeong, and tries to seduce Nam-soo. However, Mi-yeong gradually falls for Nam-soo and eventually goes so far as to push Ji-hee, the legal wife, out and take on the role as the new lady of the house. Unable to just stand by and watch, Ji-hee begins to plan her revenge.