Bloody Heart (Korean: 붉은 단심; RR: Bulg-eun Dansim) is a 2022 South Korean television series starring Lee Joon, Kang Han-na, Jang Hyuk, Park Ji-yeon, Heo Sung-tae, and Choi Ri.

[34][35] On February 3, 2022, it was announced that filming was canceled for that day after a staff and an unnamed actor tested positive for COVID-19.

[36] A day later, it was revealed that Park Ji-yeon and Yoon Seo-ah tested positive for COVID-19.

[37][38] On February 11, 2022, it was confirmed that actor Heo Sung-tae also tested positive for COVID-19, forcing filming to be canceled for that day.

[40] On March 11, 2022, Ha Do-kwon's agency announced that the actor tested positive for COVID-19 on the afternoon of the 10th, and all his filming schedules were cancelled.