Base on the Novel of the same name by Chiyul

From Tappytoon:
After being involved in a car accident together, Hajin is asked by Sihyeon to take care of Sihyeon's younger sister after his death. Hajin never expected that to mean he would wake up in the hospital in Sihyeon's body instead of his own. Even worse, Sihyeon was an infamous idol who would do anything for money, had multiple sponsors, and was apparently about to abandon the boy band he was a part of to sign a new contract with a larger agency. At first, Hajin believes the public’s negative opinion about Sihyeon, but the more he lear... More...

Base on the Novel of the same name by Chiyul

From Tappytoon:
After being involved in a car accident together, Hajin is asked by Sihyeon to take care of Sihyeon's younger sister after his death. Hajin never expected that to mean he would wake up in the hospital in Sihyeon's body instead of his own. Even worse, Sihyeon was an infamous idol who would do anything for money, had multiple sponsors, and was apparently about to abandon the boy band he was a part of to sign a new contract with a larger agency. At first, Hajin believes the public’s negative opinion about Sihyeon, but the more he learns about Sihyeon’s miserable circumstances, the more enraged he becomes. Determined to get revenge in Sihyeon’s stead, Hajin decides to reach out to an old acquaintance for help. However, the deeper he goes into his revenge plot, the more people he becomes entangled with...

Original Webtoon

Official Translations:
English, S.Chinese, Thai

Original Novel:
•Ridibooks:
Chapters, Volumes
•Kakaopage:
Main Story, Side Stories, Photobook, Exclusive Specials (2022)

Notes:
°Ridibooks "Volumes" include both the Side Stories and Photobook.
°The Side Stories are R19 but on Kakao they revised it to R15
°The Exclusive Specials released 2022 on Kakaopage only, after it being serialized it will be added to other platform's later.
°All links to Kakaopage, except the Specials, are Volumes not chapters Less...