In the first episode of Doctor Stranger, Park Chul(played by Kim Sang Joon) got killed in front of Park Hoon(played by Lee Jong Suk). Previously, Chul came over to North Korea to perform a heart surgery on Kim Il Sung. He brought his son along, and after the surgery was successfully done, they were trapped in the country. Hoon was in a situation where he had to put someone innocent in danger in order to save his girlfriend, Song Jae Hee(played by Ji Se Yeon)’s life. Chul, who knew about Hoon’s agony, suggested him to come to Budapest, Hungary with him. However, he ended up getting killed in front of his beloved son.