My Ex is My Stepmom (2018)

Joon-soo was dumped suddenly by his girlfriend Sung-eun and is surprised by his father’s news of re-marriage. What’s even more surprising is that his step-mother to be in his ex-girlfriend Sung-eun. This is unacceptable and Joon-soo is in pain until a mysterious woman named Minki appears in front of him. She knows about him and his real mother. She tells him good things will happen to him and leaves after giving him a frame with a picture of a cat. A sexy woman appears the next day and comforts him, making his step-mother jealous. Will Joon-soo get over his ex-girlfriend? Or will they get back together.

Unfortunately the movie My Ex is My Stepmom is not yet available on HBO Max.