In high school, the free-spirited Jung Da-ae and the diligent Lee Han-eol despised each other. Now, their older siblings—Mirim and Tae-gang—have fallen in love and decided to get married, though it does not quell the eight-year-long hatred between the two bitter enemies. Tragically, Mirim and Tae-gang die in a car accident on their wedding day, leaving their loved ones devastated. As Da-ae and Han-eol get into yet another fight during the funeral, a speeding truck hits them, and they awaken in their teenage bodies with their memories intact. Da-ae and Han-eol still cannot see eye to eye, but there must be a reason they were sent to the past together. When they find Mirim's diary from the original timeline, detailing the beginning of her relationship with Tae-gang, everything starts to make sense. For the first time in their lives, Da-ae and Han-eol agree: to save their beloved siblings, they must prevent them from ever meeting. [Written by MAL Rewrite]

Goodbye, In-Law! is originally a webtoon series which was officially published in book format by The Origin (더오리진) from April 1, 2020, to August 12, 2020. The series has been published digitally in English by Tapas since January 31, 2021.