In ‘My Demon’ episodes 3 and 4, Song Kang’s charismatic portrayal of a demon losing his powers and Kim Yoo-Jung’s charming CEO character are accompanied by unexpected plot twists. A twist of fate occurs with the suspicious death of Joo Cheon-sook, who leaves her wealth to Do Do Hee with the condition of marriage. Do Do Hee, in a desperate bid, proposes to Jung Gu Won, who rejects her. Despite this, they team up to find Joo Cheon-sook’s murderer.