Extra of 26 series (refer to Related Series field) [Original Webtoon](https://comic.naver.com/webtoon/list.nhn?titleId=721260) [Official Indonesian](https://www.webtoons.com/id/romance/2dboyfriends/list?title_no=1545) [Official S.Chinese](https://www.dongmanmanhua.cn/METROPOLIS/erciyuannanyoudaquan/list?title_no=1341) [Official T.Chinese](https://www.webtoons.com/zh-hant/romance/my2dbf/list?title_no=1534)

Seo-Hwa unknowingly enters a bizarre alley on her way home. There are bloody handprints and twisted walls. Seo-Hwa wanders down that cursed alley that resembles a nightmare, trying to find her way out... (Source: Manhwakyung, translated)