Parasite actress Park So Dam Is a fighter against cancer. 

The South Korean star—who played sister Ki Jung in the Oscar-winning film—was diagnosed with papillary thyroid cancer, her agency, ArtistCompany, told CNN on Monday, Dec. 13. The company added that Park, 30, received the news during a health checkup and has already gone through surgery.

Park was getting ready promote her next film Order Special, but her illness changed her plans and left her “very disappointed,” per the statement.

“Park So Dam will focus on her recovery so that she can see you all healthy in the future, and ArtistCompany will also do our best to help the actor recover her health,” the statement said. She also expressed gratitude to her crew and co-stars for helping her “overcome this difficult time together.”

According to the American Cancer Society, the type of cancer starts in the thyroid gland, which creates hormones that affect a person’s metabolism, body temperature, heart rate and blood pressure.