Sister’s Younger Husband

The content of the Sister’s Younger Husband begins with Mi-yeon, who was adopted by a family since she was a child. When she grew up, she went out to live with her sister who was not related to her by blood but was also considered an older sister and the two were very close to each other, that is Si-yeon and Si-yeon’s husband. Every day passed peacefully with the life of the three people living together, however, everything began to change when Mi-yeon accidentally witnessed her brother and sister having sex in the room while the door was left ajar. This seemed to make her desire rise and after each time she “did it herself”, she “wanted” her brother-in-law more than ever.
One day, Mi-yeon decided to seduce her brother-in-law and the two ended up with physical actions that should not have happened, the two stuck together like real lovers. However, at this time, Mi-yeon discovered that her sister was also having problems outside of marriage. Mi-yeon tries to clear up her relationship with her brother-in-law in the hope of getting rid of her guilt. However, she hears something shocking from her lecherous brother-in-law. Let’s see how this relationship goes and whether her sister discovers their secret affair.