Lee Min Ho makes the decision to send Kim Hee Sun back to the future because she lost the antidote.
On the night of the 23rd, during SBS Monday-Tuesday drama 'Great Doctor', Choi Young (played by Lee Min Ho) became fiercely angry when he found out that Yoo Eun Su (played by Kim Hee Sun) did not tell him that she lost the antidote.
Yoo Eun Su tried to put on a brave face and said that she could just make the antidote again, but Choi Young said, "I broke my promise to send you back because I was selfish. Even though I had no way to protect you and risked your life in the process. I take back the words I previously said when I told you that I would ask you to stay." With these words, Choi Young was ending their relationship.
At this, Yoo Eun Su pleaded to stay by Choi Young's side, "I am going to make my medicine and stay here. I am going to stay here and stay by your side. I refuse to waste my time worrying over whether I should go or not. If things don't go well, I could die in front of you. If that happens, I want you to watch over me. Don't leave me alone and keep me in your arms until the end."
However, Choi Young wanted to go to heaven's gate immediately and wait for it to open there. Yoo Eun Su said in tears, "And then after that? After you send me away, and then what? Have you thought about how life would be like for me? Did you ever even think about how I would feel?"
She said, "Yes, I would live on in my room in heaven. I would just live there. Every day, I would see the faces of people that I don't know. Every day, I would have aimless conversations. Every night, I would return to my empty room and ask once, 'Are you there?' I know. That there won't be a reply. And then when morning comes, I would live the day like the previous day again. Like a dead person. You don't know what it feels like to live like that? You do know. Because you will be doing the same," as she sobbed.
Choi Young's feelings for Yoo Eun Su exploded onto the surface as he said, "I was not even able to stay by your side these last few days while you were dying. Instead of finding the antidote to save my woman, I was killing people. So how can I protect you? How can I ask you to stay by my side?"
