Lee Miyun

Ex-wife of Sungyoon and mother of Shinhae.

After Sungyoon loses all his money, she destroys any evidence he might use to save himself.

Then she threatens Sungyoon with keeping him from taking Shinhae with him (he is jobless and in great debt) and causing psychological damage to Shinhae. She states that she sees Shinhae as extra baggage on her new life. To stop this, Sungyoon had to stop on following up on the betrayal.