"A Hundred Year's Inheritance" Choi Won Young becomes extremely happy after learning that Lee Jung Jin and Eugene are siblings.

May 26, the 42nd episode of the MBC weekend drama "A Hundred Year's Inheritance" featured Yang Choon Hee (Jeon In Hwa) finding out that Baek Sul Joo (Cha Hwa Yeon) had switched their sons over 30 years ago.

Yang Choon Hee is unable to tell Lee Se Yoon that she is his real mother. She sees Lee Se Yoon expressing his love for Baek Sul Joo and loses the right timing to tell him. In the process however, Min Chae Won's ex-husband Kim Chul Kyu (Choi Won Young) finds out.

Still in love with Min Chae Won, Kim Chul Kyu becomes happy after learning that Min Chae Won and Lee Jung Jin are siblings. The episode ends where Kim Chul Kyu tells them, "How romantic... between brother and sister." Lee Se Yoon and Min Chae Won appear to be in shock when the episode ends.

Baek Sul Joo also tells her husband that she had switched her son with Yang Choon Hee's son. She also mentions that she thought her biological son had died but he was actually alive. Yang Choon Hee decides to keep the secret about Lee Se Yoon's birth in order to protect her daughter, Min Chae Won's love since they are not actually blood-related. Min Chae Won had been adopted when she was little.