It was revealed that Lee Dong Gun and Yoon Eun Hye lost their beloved son while fighting.
On the 12th episode of KBS 2TV Monday/Tuesday drama "Mirae's Choice" aired on November 19th, Big Mirae (played by Choi Myung Gil) goes to Kim Shin (played by Lee Dong Gun) and tells him the whole truth.
On this episode, Big Mirae showed Kim Shin evidence that her DNA is the same as Na Mirae (played by Yoon Eun Hye) and confesses that the two had married and lived as a couple.
Then, she said that Kim Shin ends up getting scouted into a broadcasting company but because of his stubborn attitude, he fights with the management and has to leave. Because of the penalty from breaking the contract, life got to be hard. The two started fighting more and more frequently.
In the end, the two were too busy fighting that they didn't take care of their child well and they ended up losing their son. This is the reason Big Mirae took a time machine back to the past. Having heard this, it will be interesting to see what Kim Shin ends up doing.
