"Wonderful Days" Choi Wha Jung told Oh Hyun Kyung that he was Ok Taek Yeon's birth mother.
On the episode of "Wonderful Days" broadcast on April 19th, Young Chul (played by Choi Hwa Jung) and So Shim (played by Yoon Yeo Jung) went to Ki Soo (played by Oh Hyun Kyung)'s room. Before this, So Shim had already revealed to Dong Hee (played by Ok Taek Yeon) that his birth mother was Young Chun.
On this day, Young Chool whispered, "I guess you already know so father, you should know as well. I was the person who deserted Dong Hee after giving birth.'
Then, So Shim criticized saying, "Will father be able to hear this with such a quiet voice?" Ki Soo said, "You said that you were the person who gave birth to Dong Hee and then deserted him" and showed that he had heard everything.
At this, So Shim asked as a favor, "Father, please don't be so harsh on him." However, Ki Soo showed his apologetic side saying, "I'm not going to be harsh on him. My son is a crazy fool and inhumane so what right do I have to be harsh. I'm the one to be cursed and I'm the one to be blamed" and showed his apologetic side.