"A Hundred Year's Inheritance" Lee Jung Jin finally learns the truth about Eugene and Yoon Ah Jung's relationship.

March 23, the 23rd episode of the MBC weekend drama "A Hundred Year's Inheritance" featured Lee Se Yoon (Lee Jung Jin) finding out about the relationship between Min Chae Won (Eugene) and Kim Joo Ri (Yoon Ah Jung).

After having a drink with Lee Se Yoon, Kim Joo Ri couldn't stand up straight. Lee Se Yoon calls a designated driver who would take her home. Lee Se Yoon picks up Kim Joo Ri's cell phone to ask about her address. The person who called is Bang Young Ja (Park Won Sook).

Lee Se Yoon takes her home to the address Bang Young Ja tells him. He had not known that the woman on the other line is Kim Joo Ri's mother. When they arrive in front of Kim Joo Ri's house, Bang Young Ja is waiting outside but hides when she sees the car coming. When Lee Se Yoon leaves she helps Kim Joo Ri walk inside. Right then, Kim Cheol Kyu (Choi Won Young) arrives home as well.

On the way home, Lee Se Yoon realizes that the place he just dropped Kim Joo Ri off is where Min Chae Won used to live. Lee Se Yoon had been to the front of Min Chae Won's house before her divorce. He murmurs to himself, "It's definitely Chae Won's ex-in-laws' house."

Lee Se Yoon goes back to Kim Joo Ri's house where he sees Bang Young Ja and Kim Cheol Kyu taking Kim Joo Ri inside. Lee Se Yoon says to himself, "Chae Won's mother-in-law is Joo Ri's mother? Then, Chae Won's husband was Joo Ri's older brother?"

While Lee Se Yoon has the completely wrong idea about Min Chae Won, what will he think of her after finding out their relatioinship?