The Crash Landing On You star, who got married to her on-screen partner Hyun Binon March 31, shared the news.
The 40-year-old actress said, she is being careful and hasn't spoken to anyone around her yet.
Her translated post reads:
"How are you doing? I'm doing well ^^I will be careful and happy to share the good news today~ A new life has come to us. I'm still dumbfounded, but I'm feeling anxious and excited because of the changes in my body~I'm so grateful, but I'm so careful, that I haven't spoken to anyone around me yet. As much as we do, we're going to share the news with fans and people around us before it's too late.
She adds, "We will protect the precious life that has come to us~ I hope you will be healthy and keeping the things that you dear in your life. Be happy."