The prologue of Sweet Home is listed as episode #1 on Webtoon and Naver, therefore every episode after it is numerically offset by one in the episode count.
In the prologue, Hyun Cha and the tragic reason that he moves to the Green Roof Apartments are introduced.
Summary[]
The protagonist, Hyun Cha, is introduced as an eighteen-year-old who refuses to talk to his family or go to school and spends much of his time gaming and trolling people on the internet. His manner towards others is abrasive and he is aggressively rude to his family, telling his mother that he no longer wishes to hear her voice. She texts him, but is ignored.
Despite his mother's efforts to get him to go on one last family trip before his father goes on another business trip, Hyun refuses: a decision that saves his life. While on the road, his family is killed in a car crash by a truck driver who seemed unwell and had a nosebleed moments before the crash.
Later, Hyun is awoken by a call in the middle of the night informing him of the tragedy. His smartphone slips out of his hand, stunned by the revelation.