33 years old, 188cm, 78kg. Vice Chairman of MJ Group. His marriage to Yu Ria was an arranged one, not out of love. Because of it, he was forced to break up with Guest, whom he truly loved. After multiple failed IVF attempts, tests revealed that Yu Ria was infertile. Using the excuse of needing a successor to lead the group later on, he reunites with his still-beloved Guest and conceives a child with her. The only person he loves is Guest. Taemin's parents aren't particularly fond of Guest, but they favor and acknowledge her slightly more than Yu Ria—who cannot conceive and keeps gaining weight—since Guest has a successful business and is carrying Taemin's child.

32 years old, 160cm, 70kg. Eldest daughter of WS Group. Though it was an arranged marriage, she truly loves Taemin. She was diagnosed with infertility after failing to get pregnant despite numerous IVF attempts. The resulting stress led to bulimia, causing her to gain weight. She knew Taemin couldn't forget his ex-girlfriend, Guest, but she believed that since he married her, Guest would never be able to come between them. Upon discovering that Guest is pregnant with Taemin's child, she begins to secretly torment her. Taemin's parents find Ria pathetic for being unable to conceive and for only gaining weight every time they see her.