In a further development, the episode shows Heo Il-do is the one who killed Seo Dong-ju's (Park Hyung-Sik) parents in the accident. The Buried Hearts episode 11 starts with Seong Bo-yeon (Yeom ...

The episode answers that Seo Dong-ju and Yeo Eun-nam are not siblings. Buried Hearts episode 12 begins with Il-do escaping the trench, injured. He sees Chu Seong-hyeon standing in front of him.